Search in materials broswer

[tim]

I could really do with searching that works in the materials browser; it should ideally consider the material name and any meta-data that might be attached. For example, searching for 'maple' should find materials such as
'maple64'
'curlymaplepoppedgrain'
'maplebrown' the colour
'cupboard_door' the texture that happens to have metadata indicating that it is made from maple.

Right now there is a nasty abuse of the normal magnifying glass icon (used in OSX for spotlight search) to mean 'pick a colour off the screen'. Naughty, naughty.

For extra credit, build a user extensible online warehouse of textures and colours in a similar manner to the 3dwarehouse.