Feature command queue after morph commands

[pavanvo]

This PR kinda improved command priority system, more intuitive, without any restrictions

• [x] fixed #236
• [x] disable stop command with pressed shift
• [x] test in few internet games
• [ ] may be refactor https://github.com/pavanvo/megaglest-source/blob/8d141ca57fc466c6bcda2e8c7ae268b22b63ae0c/source/glest_game/type_instances/unit.cpp#L748 , but now I think it works pretty fast
• [ ] fix bug what allowed to press, morph unit cmd quickly after morph was aborted, for instance: when position is invalid

[pavanvo]

I think we need to, update abilities UI on position invalid and another cast blocking staff like stuns