[Premake] Removed unused/unnecessary subprojects.

- Testing currently doesn't work
- VFS Dump is unused. You can use internal function for it
- Demos are only for fun
- Trace Dump & Trace Viewer (unsure, but ok)

You can re-enable them by changing values: enableTests and enableMiscSubprojects in main premake file.

In the future there should be xb command support to overwrite them

src/xenia/ui/premake5.lua

@@ -14,10 +14,6 @@ project("xenia-ui")
   local_platform_files()
   removefiles({"*_demo.cc"})
   removefiles({"windowed_app_main_*.cc"})
---  filter({"configurations:Release", "platforms:Windows"})
---    buildoptions({
---      "/O1",
---    })
   filter("platforms:Android-*")
     -- Exports JNI functions.
     wholelib("On")