* Update damage_source.json
The list of damage sources have been updated and added new possible damage sources.
Damage source `attack` has been deprecated going forward and has been split into two, namely: `entity_attack` and `entity_explosion`.
Damage source `fatal` has also been deprecated in newer format/`min_engine` versions, and has caused content log errors upon testing. But will remain for backwards compatibility.
* Implement some missing `ui/` schemas
- Add `allow_debug_missing_texture`
- Add `propagate_alpha`
- Add `use_child_anchors`
* Tweak descriptions of `item_ref`
It should be noted that UI are referred to as "elements."
Moreover, the examples used colon (`:`) instead of dots (`.`) which contradicts the given description.
* Add more enum values to the `easing` property
These are all known values, aside from the five that was given.
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