remove placement-violating building morphs

List of removed morphs [footprint]:
LLT [2] -> Stardust [3]
HLT [3] -> Annihilator [4]
Gauss [2] -> DDM [3]
Defender [2] -> Hacksaw [3]
Defender [2] -> Razor [3]
Hacksaw [3] -> Chainsaw [4]
Flakker [3] -> Screamer [4]
Chainsaw [floats] -> Screamer [land only]
HLT [floats] -> DDM [land only]
Stardust [floats] -> Gauss [land only]
LLT [floats] -> Newton [land only]