Adjustable Addon Weights

[Hachem_Muche]

I've just spent some time tracking down a tricky compatibility issue between addons that can be easily worked around by changing addon wieghts. (See http://forums.te4.org/viewtopic.php?p=161531#p161531, This looks like a disparity between instantiation of superloaded files and hooks processing.)

Since it's impossible to anticipate all of the possible combinations of addons/weights that might be needed to make everything compatible, it would be very helpful if the player could adjust addon weights from the addons screen.