no more manual icon css (almost)

add code to generate css rules for boosts and badges, should only need
to manually add rules in special cases
add icon images batch 1
add icon attributes to batch 1
typo fixes
fix file names
icon images batch 2
add icon attribute for new icons
fix file names
typo fixes / special loot section icons

replace loot section icon with new, "non-plus" icons, this has broken
some "default" icon functionality for the time being
more typos / fix defaults

the fix for the defaults is a little bit ugly ("boost_boost"), but it
works and sections can now have a separate image from the boosts
themselves
Merge pull request #578 from LucidCrux/more_icon_stuff

More icon stuff