Fixes #6602

Going to hold off on this until sourcelair/xterm.js#224 is merged.

This reverts commit 0a5a071c.

Also add the rest of the commands.

Part of #10302

Fixes #7269

Windows: ctrl+up/down
Linux: ctrl+shift+up/down
Mac: cmd+up/down

Fixes #10302

Part of #9704

Fixes #6731

When ctrl+m is pressed (only use default keybinding for now), tab will not be
passed to the pty and instead will propogate up and shift focus.

Part of #6731

Fixes #9460

Fixes #8333

Fixes #8219

Fixes #6451