[Zdoom] Gojira Monster updates

Progress on Zandronum Multiplayer mod:

Shodai Gojira: 95% coding | 80% sprites
Showa Godzilla: 62% coding | 50% sprites
Showa Ghidorah: 70% coding | 50% sprites
Showa MG 1: 80% coding | 50% sprites
Kong: 0% coding | 40% sprites
Spiega:  N/A coding | 90% sprites
Showa Rodan: 50% coding | ?% sprites (outsourcing for this one)

Note: No permission necessary for these sprites, but give credit.