Add "_layer" property which can be "behind", "character" or default "chat". This deprecates the "under_chatbox" property

…etting being enabled but just for that 1 effect

…desk

add new "over" layer which is over everything in the viewport but under the chat box

…aracter offsets if explicitly told to

…talking about.

Add "loop" effect property so you set up in the ini if the effect should loop rather than it using the file's loop settings
Add "max_duration" effect property
Add "cull" effect property which decides whether to clear the effect or not when it's done (if loop is false)

…able.

However, since order may or may not matter, you can optionally include index:name and it orders it properly.

… misc theme exists

…'t play effect sound and prefer the sfx we chose instead.

…ayers