[ETF] Entity Texture Features

[4.6.1]

Several fixes, primarily for the random property system rewrite in 4.6.0

• fixed api methods not being static
• fixed texture names ending with numbers not correctly using a "." to separate the variant (e.g big_chungus_0.png should variate with big_chungus_0.2.png)
• fixed health property not working at all in 4.6
• fixed health property percentage mode values not being rounded as integers (an entity with health percentage 3.5% would not trigger 0-3% or 4-6% checks, which they do in OptiFine)
• fixed range property values not working correctly (e.g 12-33 )
• further api additions for EMF
• removed some log spam related to player head blocks

• rewrote the Random Property reading code to be more object-oriented, stable, and simplified. This also allows other mods to add new random properties for easy use in ETF & EMF. Random property code now only stores the entities initial conditions if they have been tested by that random property already, reducing memory usage.
• fixed the name property not respecting text formatting codes e.g. "name=\u00a74\u00a7oName"
• fixed crashes during random entity property testing in ETF and EMF, all random property testing should be stable even with unexpected failures.
• a lot of source code shuffling around and the inclusion of JavaDocs for API relevant classes.