Add new Any dialog modifier abilities

[NCKiser]

Adds a "Modifiers" checkbox to the Any key dialog which is only enabled when the keycode is Basic, Mod-Tap, or OSM.

When "Modifiers" is checked, the keycode is stripped down to its basic component, and the other components are reflected in the new toggles. The resulting keycode is shown in along the bottom of the window.

When the "One-Shot Mod" toggle is checked, the keycode text field is disabled.

When the text field is not a valid keycode, the text field will be preserved, and the new toggles will default off when switching between "Modifiers" mode and standard Any-key mode.

[lesshonor]

We talked about this in Discord, but just to make it public...

It needs to do some more edge-case policing, I think.

With no modifiers actually selected, it'd make more sense to still show KC_TRNS/0x0001 as the computed keycode/value.

[NCKiser]

That is a good point, thank you for bringing this up. I will test and implement more edge cases.