MacOS transform special symbols into expected key press

[Yaraslaut]

On MacOS some symbols generated from combintation of Opt-{} and Opt-Shift-{} keys, if we use Opt as an Alt key, we want to send to the running application not special symbol, but actual combination of pressed keys, for example Alt-j instead of \Delta
We want to make it configurable

Images for layout from @whisperity

Issue is similar to #1588

[whisperity]

We need to check what Kitty does with option as alt true and false. I'll try to check this as some point, hopefully I can install kitty without littering my system too much.

[Yaraslaut]

Related to #1291