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

This ensures that on creation and when resizing the cursor is at the end
of the text rather than at the beginnig.

No need to make the server command syntax more complicated than
necessary. If the need ever arise, we'll find some other way to
distinguish the client commands. Also, the /# syntax is deprecated and
will be made obsolete in time.

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

This should fix the remaining cases of fluid not advancing or not
retreating.

No need to curb their spread artificially.

It's outdated, and it would be better to use cmake's packaging
capabilities instead, for better cross-platformness.

These scripts should not be in the root but in util/ and in fact
they are, so let's get rid of these.

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