Add `try` and `catch` to keywords

BS3 commits: 9e50078321984b4c166c35dd1be7d98151219017
Fixes 11867: Add `@panel-body-padding` variable

BS3 ommits: 914f5e6a1d6faf57988cd26c31200796a4b743a9
add dist files.

BS3 commits: 37b2c8a812337a6ed9324ba2e5dab9afbc5ad3ce