Framework for the attachment system, new object property which allows changing the color and alpha of mesh materials

New object property which allows changing the color and alpha of mesh materials. Due to the current lighting systems it doesn't work yet, but the full implementation is there

Framework for the attachment system, with no actual functionality yet

Send bone and player object to the setAttachment function in content_sao.cpp, but we need a way to translate it there and send it to the client

I will also want position and rotation offsets to be possible to apply to attachments

Network object ID from server to client. This will be used to identify the parent client-side and know what to attach to

Store start and end frames as v2f

Also move bone animations to their own function instead of object properties

Attempt to move the animation system to a more correct implementation, rather than using object properties. Incomplete and breaks functionality

Allow the LUA API to set animations to meshes as well as the animation speed. Also update animations only when needed.

Support for animation blending, though for some reason it doesn't work.

Don't enable animation transitions by default for many reaosons

Object property to store individual bone positions. LUA can specify a bone name followed by a bone position. No functionality yet. Bone rotation to be added in the following commit

Same system for bone rotation, plus a few other things I missed

Get the mesh working through the memory cache properly. Most credit goes to celeron55 for the help on this code

Get the texture from memory as well

Add .x to the list of supported formats

Update LUA API documentation

(obj, md2 and md3 are currently allowed)

Get rid of the texture string and use the existing textures array. Segmented meshes have multiple materials, and this will allow us to texture each. Do not switch to this commit yet!

If a texture string is left empty in LUA, don't modify that material. Useful so a script can change specific textures without affecting others

Fix material properties and allow lighting. Models should now be affected by light instead of being black

Players can now be set to meshes using the following test script:

function switch_player_visual()
		prop = {
			mesh="player.obj",
			texture="player.png",
			visual="mesh",
		}
	for _, obj in pairs(minetest.get_connected_players()) do
		obj:set_properties(prop)
	end
	minetest.after(1.0, switch_player_visual)
end
minetest.after(1.0, switch_player_visual)

3D model support for players using Irrlicht. Also ready the basis for mesh support on nodes / items via LUA (to be done). Supports any mesh format compatible with Irrlicht, but animations are not set up yet.

This causes textures to be deleted before they are no longer accessed,
resulting in a segmentation fault. This needs to be rewritten in such a way
that textures are deleted when the client disconnects from a server.

This reverts commit 41c00e87.

Set one or more of these in the config to turn the related option on:

mip_map = 1
anisotropic_filter = 1
bilinear_filter = 1
trilinear_filter = 1

Blacklisted characters are: / \

Version 0.4.3-rc0; increase PROTOCOL_VERSION due to backwards-incompatible InventoryList width field

Remove "Unknown inventory identifier" deserialization errors, because they can break forward compatibility

- Don't select blocks for drawing in every frame
- Sort meshbuffers by material before drawing

- You have 2 stacks: a with x items and b with y<x items
- Take a with your mouse and place it on b
- Whole stack a moves to b
- (y * 2 - x) items move from b to a
- (x - y) items are left to the mouse cursor

- Display message when associating a key already in use
- Fix issue for not beeing able to assign space to an action
- Cleaning up
- Make it build (by celeron55)