[ETF] Entity Texture Features

reupload after accidental delete

• fixed the transparent skin settings
• changed the transparent skin settings into a single option, it is set to only allow for skins using ETF features by default, but can be enabled for all skins.
• ETF player skin features now support legacy format skins and will auto convert them to the new format when saved
• the ETF skin feature tool now has a setting to prevent ETF from adding the example template to your skin, thus no longer overwriting any extraneous pixels in your skin
  • the skin tool now prompts users to set this setting when the skin tool first tries to apply one of the templates in a way that would override any extraneous skin pixels
  • the templates have been broken up into several smaller partial templates to only try and apply to skins explicitly using them
• added gaps into the jacket options text for readability
• fixed coat length setting not being bound between 1 and 8