Hypoelasticity added (including GPU support)

@js-spratt Congrats on the large effort to add hypoelasticity to MFC! It is now included in the main repository, including 1-3D support and GPU support via OpenACC (performant, at that!). Thanks to @henryleberre for helping with the logisitics.

Release v4.0.0

The biggest update to MFC so far includes:

• GPU support via OpenACC
• CI and full test suite
• New build system including CMake
• Support for Windows, Mac (Apple Silicon and x86_64), and Linux distros
• Bug fixes
• Much more...

QBMM

Bubbly flows now support quadrature-based moment methods!