[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