New slider rendering works by rendering the slider to an
offscreen buffer
Add CurveRenderState.java and FrameBufferCache.java that were forgotten in the last commit
This fixes the errors in the libraries that opsu uses that
the new html linter in the Java 8 javadoc tool catches and
classifies as error.
Whether or not this should be merged or whether this should
be fixed upstream first is for someone else to decide :P
This fixes the errors in the opsu src that the new html linter in
the Java 8 javadoc tool catches and classifies as error
(unless the linter is explicitly disabled)
Peter Tissen