Redid the experimental spawn rates, greatly reducing them, and changing progression a little. Should be able to host larger waves with few T4's spawning now. The T4 Spawn Rates can always be increased under the Experimental/Boss Frequency settings.
Added 4 new T4 defense units for players. They are in need of play testing and balancing.
UEF - An artillery unit that fire napalm canisters, doing damage over a large area for a period of time. Dooms suffer 1.5x damage to the Napalm canisters. No energy draw.
Cybran - A powerful stun cannon, capable of even stunning T4's and Dooms (though Dooms must get close). Energy hungry.
Aeon - Oblivion cannon, direct fight, high damage and long range. Very power hungry.
Seraphim - A T4 tac launcher, deploying two energy beings on impact that attack everything in range for 20 seconds, including air. Reduced damage against Dooms (1/3rd damage).