[New Feature] Trigger actions for enabling and disabling Short Game

[Rampastring]

Description:

CnCNet ts-patches has trigger actions for enabling and disabling the "Short Game" session option on-the-fly. It might be useful for some special game modes.

Additional Files:

CnCNet ts-patches implementation: https://github.com/CnCNet/ts-patches/blob/master/src/trigger_actions_extended.asm#L121