added suport for vim and emacs keymaps (codemirror updated to 3.20)
rename from mode to keymap bindings (Vim and Emacs bindings)
if a function
all configuration and required libs in the config tiddler
Merge branch 'codemirror_keymap' of https://github.com/jbolila/TiddlyWiki5 into jbolila-codemirror_keymap