Spanish Keyboard

[ikjordan]

Add generic Spanish keyboard support, including generic dead key and Alt Gr handling.
Written for, and tested on, Linux X11 and MS Windows

Main areas:

1. Add ES keyboard option for command line and sqlux.ini
2. Add ES keyboard map
3. Split left and right Alt keys, to allow detection of Alt Gr key combinations needed in Spanish
4. Add generic dead key support, which should make supporting other keyboard types easier in the future
5. Handle SDL keycode differences between X11 and MS Windows Spanish keyboards
6. Trivial update to Linux mingw build instructions, found during testing

Notes:

1. Extensive testing in Linux by Badaman from QLforum, as a native Spanish user he helped to track down bugs and correct misconceptions I had on how a Spanish keyboard operates. Also tested on Pi OS (X11) and MS Windows.
2. Does not work on Pi OS with SDL2 configured to use Wayland, as currently Wayland does not enable SDL2 to generate key press events for dead keys.
3. To mark the inclusion of Spanish keyboard support Badaman asked if the next sQLux release could be named using a Monty Python Spanish Inquisition theme. The name "Comfy chair" was suggested