Merge pull request #21 from squeek502/gui

Added redstone signal transmission to the GUI
Big rendering/visual update
 * Slightly transparent side boxes have all been replaced with a single box with slightly transparent glass textures (taken from default Minecraft glass)
  + This allows for culling to be enabled, fixes other culling errors (like sometimes not drawing the obsidian side of a block extender when looking at it through an adjacent block extender), and makes the .99 scaling unnecessary
 * Things with customizable insert directions have colored sides
 * Wireless block extender no longer has a base, but instead has a smaller block extender that rotates inside of it
 * Block extenders/buffers no longer ignore lighting values (looks better to me)
 * Buffer ender pearls move in horizontal circles instead of up/down
Changed the inner block extender of the wireless block extender to the advanced filtered block extender since that probably makes more sense
Some code cleanup to get rid of unnecessary lines/files
Merge pull request #22 from squeek502/rendering

Big rendering/visual update
Sore work on fixing #24
Fixed #24 (advanced buffer GUI problems)