- 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

- fixed possible wrong location for a new egg sometimes
- add incubation planet depletion, with each incubation it may blow to shattered planet depending on planet size or become just an asteroid after all
- failed incubation leaves remnants of dragon embryo as alloy and mineral deposits

Replace Deep Crust Engineering with Deep Core Mining tech as more common. The first one is not available if your colonized planets have no related blocker.

- fix bug preventing improved hatchery to appear in techs

- fixed lost scope to get dragon armor tech option

- add chance to get special armor tech option even if dragon_armor is not yet researched
- name escaped dragon names system-based instead of planet, i.e. "Sol Beast" instead of "Sol I Beast"

- more work to reduce load of MTTH events
- fixed 'dragon fear' stations and aura effect
- reduce requirement for initial egg hatching to tier 2 techs in biology and mining. For improved hatchery you need to know tier 3 'Secrets of Life' and 'Deep Crust Miniing'