Various small GUI- and NEI-related improvements and tweaks

This PR contains the following changes:
- Creative Capacitor Bank items will not have a durability bar
- GUI tank rendering code is tiled instead of stretched
- Fixed up minor details in various GUIs (missing pixels or shades, wrong colors, misplaced tooltips, etc.)
- NEI handlers display recipe buttons themselves
- Tanks in the Vat NEI handler can be clicked to look up the crafting/usage of the fluids themselves (not the containers)