apple/apple2e.cpp, apple/apple2video.cpp: Improved IIe keyboard layout/language switch handling. (#12756)

* Added UK variants of Apple IIe Platinum and Apple //c.
* Removed the 40/80 column switch from Apple //c+.
* Added the 40/80 column switch the the Franklin Ace 500 and VTech Laser 128 series.
* Added the keyboard/language selection switch to UK, French and Spanish //e variants and various clones.
* Added the character set switch to the Franklin ACE.
* Added DVORAK mod support to US Apple //e models and VTech Laser 128 series.
* Improved key labels and default assignments, and added notes about keyboards and ROMs.
* Initialize //c+ drive state variables on start.

New working clones
------------------
Apple Computer Apple //c (UK)
Apple Computer Apple //c (France)
Apple Computer Apple //c (UniDisk 3.5, UK)
Apple Computer Apple //c (UniDisk 3.5, France)
Apple Computer Apple //c (Original Memory Expansion, UK)
Apple Computer Apple //c (Original Memory Expansion, France)
Apple Computer Apple //c (rev 4, UK)
Apple Computer Apple //c (rev 4, France)
Apple Computer Apple //e (Platinum, UK)
Apple Computer Apple //e (Platinum, France)
Apple Computer Apple //e (France)

Author: as-tb-dev