Update to a better method of autoloading cards.

API update.

Whenever an encoder is spawned in, it now checks if there is already a variable called MTGEncoder attached to the Global object. If not, it makes it and sets itself as the variable member. This way you only need to write something like this:

if Global.getVar('MTGEncoder') ~= nil then
/t #DO API CALLS
end

To interact with the encoder.