[stable, beta] Arrow functions and various improvements

Key points since the last stable release:

• There’s now a (very simple) tag editor for assets.
• There’s now a shorthand syntax for functions (() => {} instead of function() {})
• There’s now an option to cache text-based files in memory to avoid disk access (Navigation ➜ Cache assets in memory).
  This speeds up subsequent project reloading times by a lot.

Fixes since the last beta:

• Fixed code indexer sometimes incorrectly marking code in argument default values as local variables
• Fixed a softlock-crash related to using macros that expand to square brackets
• Fixed “project finished indexing” event sometimes being dispatched to plugins multiple times.
• Files are now re-indexed when reloading them after changes on disk, which fixes a few oddities.
• Added a few safeguards to type checking to deal with circular references better.
• Fixed custom a in b not having bool type.
• Fixed the new vars argument in instance_create functions not being recognized.
• Static variables are now treated as local variables, which is closer to base editor behaviour.
• Fixed files created through treeview menu in custom projects (e.g. Rivals of Aether mods) not being openable until reload.
• Fixed tree view colors not working with new beta IDE format
• (func()) is now considered a valid statement.
• Errors are now shown for clearly-malformed switch blocks.
• Field order now matches the new default for 2022.8+ projects
• Fixed collision events with same object type not being read correctly.
• Fixed find-replace re-formatting YY files to 2.2 style indents.
• “Implicit redefinition of type for local variable” now works better with block scoping enabled (read: will not complain about redefinition in different methods inside a constructor).

Hotfix (Oct 21):

• Fixed local variables not getting indexed in non-scripts.

Hotfix (Oct 25):

• Fixed more cases causing indexing issues in new-format GM projects.
• The last argument for instance_create_ functions is now type-checked (to make sure that provided variables are part of the object).
• Added type definitions for time source functions.
• Fixed struct[$key] = val confusing the indexer into thinking that the variable is an array (instead of struct).
• More fixes for “collision with self” events not opening.

Hotfix (Oct 29):

• Fixed arguments and local variables of static functions inside constructors not highlighting right.
• Fixed if (func()) not being considered wrapped in parentheses.