#169 Virtual Keyboard

[efa]

hi,
please add a Virtual Keyboard, like the current menu Help, Keyboard but with cliccable Keys.
This help the feeling of a real rubber ZX Spectrum.
CAPS SHIFT and SYMBOL SHIFT can be made togglable.

Maybe next a Spectrum+ keyboard can help too.

Many current developed emulators has this feature:
https://en.wikipedia.org/wiki/User:Efa/sandbox
ZX-Poly, ZEsarUX, Spectaculator, ZXSP, ZXDS, Turbo80