render test 2

test release
fix crash when message has no head
apply opacity to in-text head rendering
(also experiment with handling player entity names)

render test

test release
new config option Render Position:
"Before Line" is old rendering (still the default)
"Before Name" tries to render heads right before the player name, addressing #103 and #68

font_test2

allow server resource packs to disable chat heads via "assets/chat_he…

font_test

disable chat heads when it find custom characters used for head in va…

experimental opacity fix

experimental opacity fix, correcting the blending of skin layers when chat is transparent