Improve keyinput on non us layouts

[sorcerersr]

Improves keymapping for non english keyboard layouts (#2731)

On non english keyboard layouts the logical_key and the physical_key of the KeyEvent may differ e.g.

physical_key: Code(KeyZ), logical_key: Character("y")

which is mapped to a KeyPress struct with values

KeyPress { key: Keyboard(Character("y"), Code(KeyZ)), mods: ModifiersState(CONTROL) }

This PR uses the value of the logical_key to get a KeyInput with a matching Keycode which leads to
a KeyPress with matching Character and Code:

KeyPress { key: Keyboard(Character("y"), Code(KeyY)), mods: ModifiersState(CONTROL) }

or

KeyPress { key: Keyboard(Character("z"), Code(KeyZ)), mods: ModifiersState(CONTROL) }

This fixes many keybindings like Ctrl+Z (#2775).

Unfortunately not all keybindings are fixed. For example Ctrl+= is still not working.
On a german keyboard the equal sign "=" is reached by pressing Shift+0.
The KeyEvent for this case will be Ctrl+Shift+= which obiously doesn't match the keybind Ctrl+=.