Guacamole Keyboard support + choose layout

Use Guacamole as keyboard module and change keyboard layout.

Changes made:

KeySyms are now directly sent to server in uint64.
Official guacamole keyboard is used to convert JavaScript's KeyboardEvent to X11's KeySym.
KeySyms that don't exist as KeyCodes are mapped. https://github.com/nurdism/neko/commit/8a56f238add4dc4e241704905d743efb52597406#diff-91b69ff1cad0a2b44df2125d28965633R104-R113
New GUI Select in Settings, to choose kbd Layout.
New WS message control/keyboard, that changes keyboard.
Keyboard is changed only if user is hosting session, and when:
- User changes language manually in select.
- SetHost is changed - User requests control, or gets control. Meaning, that Layout is independend for each user since it always changes immediately after users has control.

For basic keys it should work independently of chosen keyboard, but to get full support, keyboard needs to be changed.

Could be improved:

Loading languages is from static file at frontend. Though, all available layouts can be found here: /usr/share/X11/xkb/rules/base.xml. It would be neat, to make XML parser and feed those data dynamically.
Layout is not changed using Pure X11 API. I could not find any usable solution, this looks simply enough. It is limited to only 2 characters. https://github.com/nurdism/neko/commit/4a7800c93fdab183a3bacd7c21a7001c02a36dec#diff-91b69ff1cad0a2b44df2125d28965633R170-R173

Fixes #72.

nurdism / neko