Animate and defile imp rate changes,

Animate chance to increase lowered from 75 to 20, meditate ratio raised from 30 to 40 and cast time lowered from 20 sec to 10 sec base. Removed unused duration code.

Defile chance to increase lowered from 100 to 25. Already has 10 sec cast time.

Both cast times are now in line with Portal of Life. Improve rates were artificially high due to errors with improving these spells that have already been fixed.