Anaglyph stereo support, created by xyz
Default anaglyph to 0.1
Add anaglyph settings to minetest.conf.example
Merge support for anaglyph stereo
Add the group attached_node
Nodes in this group will be dropped as items if the node under them or the node in the wallmounted direction is not walkable.
Only check attachment for nodes with group attached_node
New elements in formspec, item_image and item_image_button.

Fixed also game bug drawing dragged item behind fields, buttons etc.
Modify some client log message levels
On-demand item meshes and textures
Add setting preload_item_visuals
ShaderSource and silly example shaders
Implement a global shader parameter passing system and useful shaders
Add checkboxes for shaders and on-demand item visual generation
Add enable_shaders to minetest.conf.example
Remove accidental vim swap file
Install shaders properly
Fix tile MaterialType to make sense and make lava surface be shader'd lower like water
Get rid of jordan4ibanez's insane digging animation speed
Handle day-night transition in shader and make light sources brighter when shaders are used
Const-correct util/serialize.h