[QoL] Improving selection of military units

At the moment there are two drag selection variants. One for villager with ALT and one for military with CTRL.

I think it would be useful to add more modes for selecting military that would make battles smoother. These are just examples:

  • SHIFT+select for ranged units
  • SHIFT+CTRL+select for cavalry units
  • SHIFT+ALT+select for infantry units
  • SHIFT+ALT+CTRL+select for siege units

Also making hotkeys configurable in the options.