[comment addon] Make toggleComment work on empty lines
[emacs mode] Add Alt-G G, Alt-Space, Alt-;
[emacs mode] Add Ctrl-O, Ctrl-T
[emacs mode] Add Alt-C, Alt-U, Alt-L
Support integer 'how' argument to indentLine
Fix bug where 'auto' keymap transitions didn't restore disableInput setting
Fire events when keys are handled and input is read

(experimental, documentation will follow when finalized)
[emacs mode] Add rough support for command prefixes
[emacs mode] Duplicate 'emacsy'/'basic' bindings

Make them support prefixes.
[emacs mode] A few more expression-based bindings