Fuse.Platform: make internals visible to Fuse.Entities
Fuse.Platform: make internals visible to Fuse.Entities

Otherwise we'll get build errors when using this package on mobile.

Fuse.Entities are using Fuse.Platform.SystemUI.FrameChanged here:
https://github.com/fuse-open/Fuse.Entities/blob/master/src/Scene.uno#L9

kusma/fuselibs-public,cbaggers/fuselibs-public,kusma/fuselibs-public,kusma/fuselibs-public,cbaggers/fuselibs-public,fusetools/fuselibs-public,cbaggers/fuselibs-public,kusma/fuselibs-public,kusma/fuselibs-public,fusetools/fuselibs-public,cbaggers/fuselibs-public,fusetools/fuselibs-public,kusma/fuselibs-public,kusma/fuselibs-public,fusetools/fuselibs-public,cbaggers/fuselibs-public,fusetools/fuselibs-public,fusetools/fuselibs-public,cbaggers/fuselibs-public,fusetools/fuselibs-public,cbaggers/fuselibs-public