[beta] Template strings, smaller fixes

Additions:

• Template strings! Simple but convenient (`health: $hp/$maxhp`)

Improvements:

• Search results now show relative paths in directory-based projects.
• More resource types are now shown in Ctrl+T.
• #mfunc now adjusts displayed line numbers.
• Added an option to sort/not sort extension APIs.
• Added an option for disabling ctrl+wheel for changing code editor font size.

Plugin API improvements:

• Expanded AceCommands interface a little.
• Plugins can now provide descriptions of what they do.
• PluginState reference is now passed into config.init() for convenience.
• PluginState now has a string with plugin root directory.
• Added a "tabMenu" event for tab context menu.
• All "built-in" menu items now have IDs.
• Fixed `projectPropertiesBuilt` plugin event getting the wrong target element.
• Added Project:relPath for un-prefixing full paths

Fixes:

• Fixed array_* functions in GMS2 extra missing argument info.
• Fixed #mfunc some(...) asset_get_index(...) highlighting "as" prefix as a keyword.
• Fixed linter not being aware of lamdefs for function checking.
• Fixed GMEdit failing to open empty GMS2 scripts (because they might not exist on disk at all)
• Fixed lambda scripts being shown in search results with "expand lambdas" enabled.
• Fixed auto-completion menu being shown when starting to type "0x".
• Fixed #gmedit-lambda folder being expanded when adding lambda scripts.
• Fixed "Open" dialogs not working due to breaking Electron changes.
• GMEdit no longer silently errors if a YY file is malformed.
• Fixed several issues with Vim input mode (thanks to @brockuniera).
• Fixed "open declaration" / "find references" not working at start of word.
• Fixed "file missing" dialog not updating the tab content sometimes.