- introduce new additional placeholders useable for building the changelog

| **Placeholder**            | **Description**                                                                                    | **Empty** |
|----------------------------|----------------------------------------------------------------------------------------------------|:---------:|
| `${{CHANGED_FILES}}`       | The count of changed files.                                                                        |           |
| `${{ADDITIONS}}`           | The count of code additions (lines).                                                               |           |
| `${{DELETIONS}}`           | The count of code deletions (lines).                                                               |           |
| `${{CHANGES}}`             | The count of total changes (lines).                                                                |           |
| `${{COMMITS}}`             | The count of commits in this release.                                                              |           |

- restructure project to return additional diff related information along the individual commits
- update testcases to verify functionality of new placeholders

__tests__/transform.test.ts

@@ -2,6 +2,7 @@ import {buildChangelog} from '../src/transform'
 import {PullRequestInfo} from '../src/pullRequests'
 import moment from 'moment'
 import { DefaultConfiguration, Configuration } from '../src/configuration';
+import { DefaultDiffInfo } from '../src/commits';
 
 jest.setTimeout(180000)
 
@@ -130,7 +131,7 @@ it('Extract label from title, combined regex', async () => {
     }
   ]
 
-  const resultChangelog = buildChangelog(mergedPullRequests, {
+  const resultChangelog = buildChangelog(DefaultDiffInfo, mergedPullRequests, {
     owner: 'mikepenz',
     repo: 'test-repo',
     fromTag: '1.0.0',
@@ -159,7 +160,7 @@ it('Extract label from title and body, combined regex', async () => {
   
   let prs = Array.from(mergedPullRequests)
   prs.push(pullRequestWithLabelInBody)
-  const resultChangelog = buildChangelog(prs, {
+  const resultChangelog = buildChangelog(DefaultDiffInfo, prs, {
     owner: 'mikepenz',
     repo: 'test-repo',
     fromTag: '1.0.0',
@@ -190,7 +191,7 @@ it('Extract label from title, split regex', async () => {
     }
   ]
 
-  const resultChangelog = buildChangelog(mergedPullRequests, {
+  const resultChangelog = buildChangelog(DefaultDiffInfo, mergedPullRequests, {
     owner: 'mikepenz',
     repo: 'test-repo',
     fromTag: '1.0.0',
@@ -221,7 +222,7 @@ it('Extract label from title, match', async () => {
     }
   ]
 
-  const resultChangelog = buildChangelog(mergedPullRequests, {
+  const resultChangelog = buildChangelog(DefaultDiffInfo, mergedPullRequests, {
     owner: 'mikepenz',
     repo: 'test-repo',
     fromTag: '1.0.0',
@@ -247,7 +248,7 @@ it('Extract label from title, match multiple', async () => {
     }
   ]
 
-  const resultChangelog = buildChangelog(mergedPullRequests, {
+  const resultChangelog = buildChangelog(DefaultDiffInfo, mergedPullRequests, {
     owner: 'mikepenz',
     repo: 'test-repo',
     fromTag: '1.0.0',
@@ -274,7 +275,7 @@ it('Extract label from title, match multiple, custon non matching label', async
     }
   ]
 
-  const resultChangelog = buildChangelog(mergedPullRequests, {
+  const resultChangelog = buildChangelog(DefaultDiffInfo, mergedPullRequests, {
     owner: 'mikepenz',
     repo: 'test-repo',
     fromTag: '1.0.0',
@@ -388,7 +389,7 @@ it('Match multiple labels exhaustive for category', async () => {
     }
   ]
 
-  const resultChangelog = buildChangelog(pullRequestsWithLabels, {
+  const resultChangelog = buildChangelog(DefaultDiffInfo, pullRequestsWithLabels, {
     owner: 'mikepenz',
     repo: 'test-repo',
     fromTag: '1.0.0',
@@ -413,7 +414,7 @@ it('Deduplicate duplicated PRs', async () => {
     method: 'match'
   }
 
-  const resultChangelog = buildChangelog(pullRequestsWithLabels, {
+  const resultChangelog = buildChangelog(DefaultDiffInfo, pullRequestsWithLabels, {
     owner: 'mikepenz',
     repo: 'test-repo',
     fromTag: '1.0.0',
@@ -439,7 +440,7 @@ it('Deduplicate duplicated PRs DESC', async () => {
     method: 'match'
   }
 
-  const resultChangelog = buildChangelog(pullRequestsWithLabels, {
+  const resultChangelog = buildChangelog(DefaultDiffInfo, pullRequestsWithLabels, {
     owner: 'mikepenz',
     repo: 'test-repo',
     fromTag: '1.0.0',
@@ -471,7 +472,7 @@ it('Use empty_content for empty category', async () => {
     }
   ]
 
-  const resultChangelog = buildChangelog(pullRequestsWithLabels, {
+  const resultChangelog = buildChangelog(DefaultDiffInfo, pullRequestsWithLabels, {
     owner: 'mikepenz',
     repo: 'test-repo',
     fromTag: '1.0.0',
@@ -493,7 +494,7 @@ it('Commit SHA-1 in commitMode', async () => {
   customConfig.sort = "DESC"
   customConfig.pr_template = "${{MERGE_SHA}}"
 
-  const resultChangelog = buildChangelog(pullRequestsWithLabels, {
+  const resultChangelog = buildChangelog(DefaultDiffInfo, pullRequestsWithLabels, {
     owner: 'mikepenz',
     repo: 'test-repo',
     fromTag: '1.0.0',
@@ -514,7 +515,7 @@ it('Release Diff', async () => {
   const customConfig = Object.assign({}, DefaultConfiguration)
   customConfig.template = "${{RELEASE_DIFF}}"
 
-  const resultChangelog = buildChangelog(pullRequestsWithLabels, {
+  const resultChangelog = buildChangelog(DefaultDiffInfo, pullRequestsWithLabels, {
     owner: 'mikepenz',
     repo: 'release-changelog-builder-action',
     fromTag: 'v2.8.0',
@@ -553,7 +554,7 @@ it('Use exclude labels to not include a PR within a category.', async () => {
     }
   ]
 
-  const resultChangelog = buildChangelog(pullRequestsWithLabels, {
+  const resultChangelog = buildChangelog(DefaultDiffInfo, pullRequestsWithLabels, {
     owner: 'mikepenz',
     repo: 'test-repo',
     fromTag: '1.0.0',