*.txt data parsed from nvim/runtime/doc/index.txt, with columns separated by
null characters (\0).
- Insert mode
- Normal mode
- Text objects
- Window commands
- Square bracket commands
- Commands starting with 'g'
- Commands starting with 'z'
- (NONE) Operator-pending mode
- Visual mode
- Command-line editing
- (NONE) Terminal mode
- EX commands
*.lua files are Lua tables converted from *.txt by to-lua-table.lua.