[REQ] Add list of entities for selection in "entity builder"

[monkeyman192]

Is your feature request related to a problem? Please describe.
When deciding if an object needs an entity it is quite annoying to find the correct one in the games' files.

Describe the solution you'd like
Located in the folder MODELS\PLANETS\BIOMES\COMMON\BUILDINGS\PARTS\ENTITIES are a number of vanillia entity files which provide a large amount of simple functionality which may be useful for custom models (eg. the static physics, objectspawner, or rotation entity files)
A drop down should be added to add one of these entities as the used one with a description of what each does.