Implement VirtualKey

[rexim]

Close #245

[codecov-io]

Codecov Report

Merging #246 into master will increase coverage by 8.42%.
The diff coverage is 64.06%.

@@ Coverage Diff @@ ## master #246 +/- ## ========================================== + Coverage 29.92% 38.35% +8.42%  ========================================== Files 23 24 +1 Lines 999 1043 +44 ========================================== + Hits 299 400 +101  + Misses 700 643 -57

Impacted Files	Coverage Δ
src/main.rs	1.2% <ø> (ø)	⬆️
src/screen/keyboard_layout_screen.rs	0% <ø> (ø)	⬆️
src/screen/looper_screen.rs	0% <ø> (ø)	⬆️
src/config/config_device_info.rs	0% <0%> (ø)	⬆️
src/fundamental/option.rs	0% <0%> (ø)
src/config/config.rs	30.3% <100%> (+30.3%)	⬆️
src/ui/virtual_key.rs	65.51% <45.45%> (+65.51%)	⬆️
src/ui/virtual_keyboard.rs	80.89% <75.55%> (+80.89%)	⬆️
... and 2 more

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