Can be turned off in the key change GUI or in minetest.conf via doubletab_space

- Display message when associating a key already in use
- Fix issue for not beeing able to assign space to an action
- Cleaning up
- Make it build (by celeron55)

Switch the license to be LGPLv2/later, with small parts still remaining as GPLv2/later, by agreement of major contributors

Defaults modified from original: alpha=200, key=F10

This is just a chat window with the / text pre-loaded.

This allows us to map the keys which are not considered in
irrlicht's EKEY_CODE system, such as \, [, /, ] etc.

Constify keycode and move the static array of localizable names from the
guiKeyChangeMenu header to the implementation file, changing its name.

now translated if set to a button

configwriting/saving isn't complete and will break your config if you use fancy keys

configwriting/saving isn't complete and will break your config if you use fancy keys