Inline functions! (and small improvements)

Additions:

• Inline functions!

Improvements:

• If a macro is pointing to a function/script/lambda, you now get argument auto-completion for it.
• `/// (...args)` style (nameless) JSDoc is now supported.

Changes:

• `#import` highlighting now works like regular highlighting but you probably won't notice anything different
• When you switch tabs, code editor in the new tab now automatically gets focus because that's what you probably want
• Extension scripts are now colored like functions rather than scripts to match GM behaviour.

Fixes:

• Fixed GMS2 script renames sometimes not renaming the extra files.
• Fixed some oddities with opening GMS2 included files.
• Fixed pointer_null not showing up in GMS1 auto-completion.
• Fixed there being multiple auto-completion entries for the same thing if multiple extension files are redefining the same functions.
• Fixed rename/remove context menu options being shown for some things that GMEdit can't actually rename/remove correctly
• Fixed a few more oddities with argument status bar (there are always more)
• Fixed blank GMS2 events saving as "undefined"
• Fixed events.gml missing GMS1-specific view events in Other category.
• Fixed a bug where JSDoc generator would disable syntax extensions for a single save when it added/removed something.
• File conflict now doesn't consider \r\n<->\n as changes.