fonts: Store the generated TrueType fonts in the repository, and rebuild them only in maintainer mode.

All these checks are done during the capability checks which are
performed under the resource type checks.

It is legal to pass Usage=0 to CheckDeviceFormat and in both this case
and in the case a format isn't available UsageCaps would be 0 and a
format would be reported available.

We assume it has the same capabilities as VOLUMETEXTURE. MSDN is very
vague on this topic. Intel/Nvidia/ATI drivers seem to offer nearly the
same caps on both, so do that too.