Waila

This is a smallish update to fix some of the outstanding bugs and add a couple custom renderers for modders to use.

Unless some more problems pops up, I will now move to 1.8 and port all the recent changes to the new MC version. So expect a new 1.8 release soon.

CHANGELOG

• [Fix] Added proper size hint to icon's custom renderer. Should fix hearts going out of the tooltip.
• [Fix] Text vs Hearts display is now based on max health, not current health. Should fix the prb with mobs having incredibly large max hp but low current hp.
• [Fix] Protected rendering call. Should solve crashes on load from some mods (Thaumcraft included).
• [Fix] Cleanup the internal lists to prevent a whole Waila tooltip corruption happening in some cases.
• [Fix] Handler insertion order is now enforced properly.
• [API] Returning a stack with a null item from getWailaStack will desactivate the tooltip for a given block. A good way to do that is to return new ItemStack(Blocks.air);
• [API] Added custom renderer "waila.health", with arguments "<maxhearts>,<health>,<maxhealth>"
• [API] Added custom renderer "waila.stack", with arguments "<type>,<idstring>,<stacksize>,<damage/meta>"
• [API] Added custom renderer "waila.progress", with arguments "<currentvalue>,<maxvalue>"