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Moved HTML pages into templates with simple token replacement
Updated some HTML styles

Other minor bug fixes and formatting changes

This clones 3rd party dependencies for modules like qtquick3d
which require initialization of the 3rd party submodules.

Qtquick3d is only available since 5.14, so we should check two things:
1) That the time of the qtquick3d sha is newer than the first
successful integration to qt5
2) And that the branch is either dev or greater than 5.13
Both conditions must be true in order to correctly determine qt5
dependency shas.