Full dynamic squads implementation

[CarsonBurke]

• start with spawning no matter if it interrupts remote spawning
  • Later delineate between defensive and attacking in spawn priority
• convert into transport mode when enemies aren't present (make more complex)
• depending on needs, spawn or don't spawn dismantler, ranger, melee-heal duo
• if squad members die in defence, remove combat request and, if a remote, add abandonment
• should support duplicate creeps of each member type