tool: add changelog_gen.sh to automatically generate changelog

scripts/.gitignore

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+CHANGELOG_LAST.md

scripts/changelog-template.hbs

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+{{#each releases}}
+  ## [{{title}}]({{href}}) {{niceDate}}
+
+  {{#commit-list commits heading='### Breaking Changes' message='BREAKING CHANGE:'}}
+    - :warning: {{subject}} [`{{shorthash}}`]({{href}})
+  {{/commit-list}}
+
+  {{#commit-list commits heading='### New Features' message='^feat' exclude='BREAKING CHANGE:'}}
+    - {{subject}} [`{{shorthash}}`]({{href}})
+  {{/commit-list}}
+  
+  {{#commit-list commits heading='### Performance' message='^perf' exclude='BREAKING CHANGE:'}}
+    - {{subject}} [`{{shorthash}}`]({{href}})
+  {{/commit-list}}
+  
+  {{#commit-list commits heading='### Fixes' message='^fix' exclude='(^fix conflict|^fix warning|BREAKING CHANGE:)'}}
+    - {{subject}} [`{{shorthash}}`]({{href}})
+  {{/commit-list}}
+  
+  {{#commit-list commits heading='### Docs' message='^docs'}}
+    - {{subject}} [`{{shorthash}}`]({{href}})
+  {{/commit-list}}
+  
+  {{#commit-list commits heading='### Others' exclude='(^fix|^feat|^perf|^docs)'}}
+    - {{subject}} [`{{shorthash}}`]({{href}})
+  {{/commit-list}}
+  
+{{/each}}

scripts/changelog_gen.sh

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+# Generate CHANGELOG_LAST.md from changes since the last version tag. (vx.y.z-dev tags are ignored)
+# CHANGELOG_LAST.md can be edited manually if required and manually added to docs/CHANGELOG.md
+#
+# Requirements: 
+#    npm install -g auto-changelog
+#
+# Usage: 
+#    changelog-gen <next-version>
+#
+# Example: if the latest verision is v5.6.7 the followings can be used for bugfix, minor or major versions:  
+#    changelog-gen v5.6.8         
+#    changelog-gen v5.7.0         
+#    changelog-gen v6.0.0         
+
+auto-changelog -t changelog-template.hbs -l false --latest-version $1 --unreleased-only  --tag-pattern ^v[0-9]+.[0-9]+.[0-9]+$ -o CHANGELOG_LAST.md