- 3.7 version update
- add tiyanki, amoebas and crystal to neutral factions. Drones and void are still not liked

- change PD weapon picture (again). It was too similar to some in other mods, also it is blue color in game, not red.
- a bit longer Egg incubation cycle for dragons

- fix incorrect use of change_planet_size instead of set_planet_size effect

- reduce frequency of new egg appearance for balance

- colored skins for special dragons

- models for special dragons
- fix missed egg decrement when growing ordinary dragon

- split hatching decisions to get different types of dragons. That allows to choose which one you want to grow. Each uses own set of resources
- fix picture for Cyborg Dragon event
- make Nanite Dragon on event picture not so yellow but a bit more white

- fixed the use of wrong values in has_hp_percentage, it should be fraction of 1, not 100

- small fixes for scope in triggers and messages