custom tech system:
each factory provides some tech, custom unit builder can only build things if factories with needed tech are nearby
cloak fac: leg, cloak, buildcost 50~1000
shield fac: leg, shield, shield gun, buildcost 50~1000
car fac: whell, buildcost 50~1000
hover fac: hover, buildcost 50~1000
gs fac: aeroengine, buildcost 50~4000
plane fac: fixed wing， buildcost 50~2000
spider fac: all terran leg, buildcost 25~2000
jumpy fac: leg, jump, buildcost 25~2000
tank fac: track， buildcost 200~3000
amph fac: amph leg, buildcost 50~2000
ship fac: ship buildcost 50~2000
strider hub: buildcost 2500~100000
or not?
or more?
cloak fac:
emg, sniper
shield fac:
slow wave, headbutt,
car fac:
aoe for cannon, heat ray, impaler, domi,
hover fac:
slow for beam, gauss, lance beam
gs fac:
plane fac:
spider fac:
pure emp,
jumpy fac:
fire thrower, fire ball(firewalker), newton, goo,
tank fac:
aoe for missile(orge), pure slow beam(cyc lel)
amph fac:
slow for cannon,
ship fac:
strider hub:
or more? (add value limits for custom while tech unfreeze it)
e.g. cannon damage <1000 unless tank fac
