…ashing.

I have been hesitant to do this because optimized-away uniforms are usually
a sign of a problem rather than something to be silently ignored, but a
recent case with HueMod in a constant-white input convinced me otherwise.

I do think it is a bit weird that optimizing away uniform reads also
optimizes away the whole uniform, seeing as how it's part of the shader
interface, but apparently that's how it works.

Also not sure this is the nicest solution to the problem (see comment), but
it's unclear what the nicer solution would be.

This is somewhat strange, since many places very explicitly want URLs,
but since all the URL constructors are deprecated, the URI class is the
only officially supported way to manipulate URLs, so just convert to URLs
as late as possible in general.

Apparently, there are still drivers that require all OpenGL activity to
occur on the thread that created the window. The main offender is MacOS.

I'm not sure why this was done to begin with, but I suspect it was to
run disposal on the same thread as rendering, for some reason. That
shouldn't be necessary now that rendering happens on the AWT thread to
begin with, though.

…ir res

Not sure if this should be considered "normal" or not.

…ings

# Conflicts:
#	build.xml
#	src/haven/Config.java
#	src/haven/MainFrame.java
#	src/haven/Screenshooter.java