Textmate grammar: raw IDs, underscore fixes (closes #6293, #6340)

[dustypomerleau]

Fixes #6293.

I've included the possibility of the r# prefix in:

• function definitions
• function/method calls
• variables/parameters

This way the raw ID will simply get whatever the intended scope was, instead of a unique scope that might be inappropriately themed for its purpose.

Will wait a bit for feedback, in case there are other places you might use raw IDs.

[matklad]

Technically a raw ID might be use everywhere a name could be, like in struct #async. But I think the most common cases are probably functions and modules.

bors d+

[bors]

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[dustypomerleau]

Ah - I’ll need to add a dedicated case for modules before merging.

[dustypomerleau]

Removing comment scope for ignored params also simplified the previous issues with underscore-prefixed functions/macros, so I've reduced the complexity of those regexes. Ignored params will now automatically be matched as variable/parameter scope, which seems preferable to those that have spoken up. Latest push also adds raw IDs for module names, in addition to the scopes mentioned above.

This will close #6293 and #6340.

[dustypomerleau]

bors r+

@matklad after you delegate, will bors still merge after additional pushes?

[bors]

Build succeeded:

• Rust (macos-latest)
• Rust (ubuntu-latest)
• Rust (windows-latest)
• TypeScript (ubuntu-latest)
• TypeScript (windows-latest)