Basic implementation of a content provider based on Minecraft's resource
loading framework.
Beware that the manual is unaware of resource domains. In other words, two
paths that are identical except for their resource domain will be the same,
as seen from the manual. This means you should probably place your
documentation somewhere other than
doc/, because that's where the
OpenComputers documentation lives, and it is queried first - meaning if you
have a page with the same path as one in OpenComputers, it is practically
unreachable (because the OC provider is always queried first).