Nerf a bit Gwai's Burninator

Improved Higher talents:
Overseer of Nations now also increases lite, infravision and heightened senses radius
Born into Magic gives a higher benefit to spell resist and also +arcane% damage
Higher's Bloom now lets your use any active talents without cost for a few turns

git-svn-id: http://svn.net-core.org/repos/t-engine4@5182 51575b47-30f0-44d4-a5cc-537603b46e54