added system.md
Fixed old regression, that stop the iteration of include rules for content style after a "*" rule
Updated unit test
Merge branch 'master' into 784865
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Bug 725409 - Modules should have metadata to specifying applications' compatibility

- Added `engines` property to metadata
- Replaced manual exceptions for unsupported application in modules
- Modified cuddlefish and loader to enable parsing module's metada during module loading
- Added methods to `xul-app` to verify the applications' compatibility
- Update unit testing
fix bug
added tests
Merge branch 'master' into 821774
Merge branch 'master' into 784865
Merge branch 'master' into 784865
Merge remote branch 'main/master' into 784865
updates to system.md
finish draftin system.md; update cfx-tool
fixing up system.md
Merge remote-tracking branch 'origin/784865' into 784865
updated code samples in guides and tutorials
update every api doc up to but not including widget.md
finished updating api docs
Merge branch 'master' into 823928