merge df4f5575e238, cant break bedrock in 0
Camera3D from boskee, glass sounds
Update USED_MEDIA_LICENSES.md
icons replacement in inventory and hotbar

allows to use seperate png files to display items in hotbar and
inventory.  a few blocks do not look great when in inventory or hotbar,
this makes for a good alternative.

only issue is that on mouse_click and drag it shows the normal textures.
fix or help with this if you can.
deleted 1 mistaken file, still works last commit
Revert "deleted 1 mistaken file, still works last commit"

This reverts commit 82dfc0115ab1fccae3e754e19f04732877398f23.
Merge branch 'master' of git://github.com/ronmurphy/Minecraft

Conflicts:
	blocks.py
	cleanup.bat
	controllers.py
	globals.py
	gui.py
	main.py
	resources/textures/button.png
	resources/textures/frame.png
	resources/textures/texture.xcf
	savingsystem.py
	world.pxd
	world.py
Re-added ronmurphy's icon and texture changes. Fixed a bug where dragged icon was different.
Cleanup