feat: more flexible keybinding parser

[tlambert03]

closes #209

modifier keys can now be expressed as:

_re_ctrl = re.compile(r"(ctrl|control|ctl|⌃)[\+|\-]")
_re_shift = re.compile(r"(shift|⇧)[\+|\-]")
_re_alt = re.compile(r"(alt|opt|option|⌥)[\+|\-]")
_re_meta = re.compile(r"(meta|super|win|windows|⊞|cmd|command|⌘)[\+|\-]")

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (e527101) to head (48e14fe).
Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #213   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           31        31           
  Lines         1835      1814   -21     
=========================================
- Hits          1835      1814   -21     

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