[ETF] Entity Texture Features

[V2.5.15] beta

• restructured how optifine properties are applied. (Biome and other non-updating properties will no longer prevent / effect updating properties like health or name.)
• added an option in Custom textures to remove property updating restrictions (E.G if disabled a desert zombie that walks into a forest will be able to change texture based on the new biome, as opposed to the default behaviour where it will keep its desert skin)

[V2.5.14] beta

• blinking now occurs truly randomly within allowed frequency
• fixed random properties sometimes being ignored in previous betas
• added a setting to allow illegal characters in texture files like spaces and capitals (Optifine parity)