Upgrade to the better user(!)-extensible sublime-syntax format

[eugenesvk]

• Allows easy user fixes by extending the default syntax without editing the packaged file since syntaxes can now be made inheritable just like other settings
• Enables easier v2 syntax upgrade: for now a user can now easily fix the issue #66 with the short file provided below And in the future when this feature https://github.com/sublimehq/sublime_text/issues/5093 is implemented, you can even include it in this package and be able to cover both v1 and v2
• Also fixes #64 and makes another minor replacement of repeated fX/joyX patterns

%YAML 1.2
---
name             : AutoHotkey2                    # extends the AutoHotkey package with v2-specific contexts
file_extensions  : [ahk]
first_line_match : '^#Requires AutoHotKey v2[\d\.\-a-z]*'
scope            : source.ahk
version          : 2
extends          : Packages/AutoHotkey/AutoHotkey.sublime-syntax

contexts:
  main             :
    - meta_append  : true
    - include      : string-quoted-single

  string-quoted-single:
    - match: (')
      captures:
        1: punctuation.definition.string.ahk
      push:
        - meta_scope: string.quoted.single.ahk
        - match: (')(?!')|^
          captures:
            1: punctuation.definition.string.ahk
          pop: true