[beta] Font/sound editors and type system improvements!

Additions

• You can now create and edit GMS2.3 fonts! (thanks to Anton)
• You can now create and edit GMS2.3 audio assets! (also thanks to Anton)
• I added an option for implicit type detection for simple instance variables!
  Located in Linter settings; when enabled, GMEdit will automatically assign types for variable assignments such as v = 0, v = "", v = buffer_create(...) and alike. This feature isn’t very smart (e.g. no support for script calls or complex expressions), but still can save you from having to type /// @is {type} in a handful of places.

Improvements

• Dark theme now looks a little nicer, especially various checkboxes (thanks to Anton)
• Rearranged the Preferences menu a little based on what you are more likely to change often
• #import remapping now works for {types} inside JSDoc comments
• Extending/implementing object or instance built-in types will now inherit built-in auto-completion and syntax highlighting items.
• self-fields are now syntax-highlighted (e.g. will show missing variables) so long as the function/event does not contain with-blocks.
• Anonymous structure literals ({...}) can now be cast to namespaces that they “implement” all fields of.
• I rewrote how syntax highlighting for @hint works, which now reflects the various degrees of madness that you can do with it.
• If methods are not given an explicit field type, they will now be typed as function<>, which will spare you of some cases with forgetting parentheses after a = func.
• Rainbow brackets no longer have a limit on max “depth” - so long as your theme supports them.
  The work involved with doing so also opens up opportunities in making highlighter a little smarter in future.
• Added a warning if file save operation fails (e.g. the file is read-only).
• Tooltips now show more information when mouseovering variables and I fixed some cases where the tooltip would tell you what the object is rather than what the variable is.
• Checks involving is_undefined(arg) will now mark 2.3 function arguments as optional.

Fixes

• Fixed linter incorrectly parsing struct[$ key]
• Fixed rainbow bracket flag for themes not being set on startup.
• Fixed inconsistencies with return types for some built-in functions
• Fixed incorrect linter types for Fixed incorrect linter types for /// @hint {type} namespace_ImpStatic.inst` combined with #import
• Fixed 2.2 GUID being technically off-spec (no visible effect).
• Fixed 2.3 shaders not opening given specific settings.
• Fixed a very specific case with syntax highlighting breaking on 3+ consecutive /// @is {type} lines
• Fixed live linter forgetting about variables in #event properties
• Fixed function name inside object events changing scope and causing warnings.
• Fixed @interface clashing with @hint X extends Y
• Fixed with blocks not changing context correctly for linter type checks.
• Fixed local variables without type information being detected as missing fields sometimes.
• Fixed static func = function()->type not adding type to function signature.
• Fixed type constraints not being allowed in some cases.
• Fixed auto-completion hints showing the “raw” type sometimes.
• Fixed : not bringing up type auto-completion when after a function(.
• Fixed context menu copy-paste not working on Mac OS.
• Fixed function<> not being allowed in some type specifications.
• Fixed a few spots where you could cast function<> to function<> with incompatible arguments.
• Fixed hint type information not being removed when hints get cleared.
  (meaning that you couldn’t “un-type” a field without hitting Ctrl+R)
• Fixed a rare softlock with outline-view involving unusually-formatted code.
• Fixed detection of #import preprocessor when a script only uses function()-> and nothing else of typed syntax.
• Fixed local variable type inference mistaking globalvars for local variable declarations.
• Fixed instance variables with names matching those of built-in “types” not being added to instance’s variable list.
• Fixed it being possible to lose @implements information when reloading a project.
• field:s inside struct literals {...} can no longer show up as “missing”, though ultimately this is a complex issue to tackle due to syntax overlap (field: vs case val: vs a?b:c vs var a:type).
• Fixed warning line highlights not moving along when adding/removing code before them (#124).
• Fixed use of argument inside constructor methods marking constructor as having optional arguments (#127).
• Fixed some cases where tooltips/status bar could not display information about very specific variable names.
• Fixed linter not handling types in #args in “live” mode.
• Fixed #90 - #args JSDoc generator shouldn’t insert spaces around =
• Using the “New IDE” button no longer causes the new window to auto-load the original project when assigning GMEdit as “open with” application.
• Fixed GMLive.js not doing anything when running code without any tabs (that is, with code in default tab).

It is entirely possible that I forgot something because there are too many changes.

Hotfix (Mar 01)

• Fixed global.varname. not bringing up auto-completion.
• Fixed type information in auto-completion info continuing to stack in some cases.
• Fixed @is and @implements not working in files with Unix endings.
• Fixed snippets overriding other auto-completion items.