rust-filepatterns: add support for `include` and `subinclude` patterns
This prepares a future patch for `IncludeMatcher` on the road to bare
`hg status` support.
Differential Revision: https://phab.mercurial-scm.org/D7909
BasedOnStyle: LLVM
IndentWidth: 8
UseTab: ForIndentation
BreakBeforeBraces: Linux
AllowShortIfStatementsOnASingleLine: false
IndentCaseLabels: false
AllowShortBlocksOnASingleLine: false
AllowShortFunctionsOnASingleLine: false
IncludeCategories:
- Regex: '^<'
Priority: 1
- Regex: '^"'
Priority: 2