-Fix stylesheets.
-Make various fields in the options window be resettable via double click.
-Get stylesheets working properly on Windows and Linux with Qt6.
-Set default style to Fusion.
--Code changes
-Get build and deployment scripts working with latest versions of Qt6, AppImage, and various library dependencies.
-Add two new macros so it would build with the latest gcc: SINGLETON_DERIVED_DECL_T and SINGLETON_DERIVED_IMPL_T.
-Small changes to opencl.hpp.
-Center progress bars on Linux.
-Proper sizing of vertical header on the xaos visualization table on Linux.
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