Generalize mass matrix implementation to StdMat and CUDA

This MR generalizes the mass matrix operator from !17 (merged) to both StdMat and CUDA implementation. MatrixFree and SumFrac implementations to be added once IProductWRTBase and BwdTrans operators available.

Unit tests have also been added for add test for seg, quad, tri, hex, prism, pyr, and tet elements. Results are compared with the Nektar++ solution.

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• e7b5d1cd - Minor clean-up

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assigned to @ccantwel

added 5 commits

• e7b5d1cd...2f9b43ba - 4 commits from branch nektar:master
• 22ecd61e - Merge remote-tracking branch 'upstream/master' into feature-mass-matrix

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approved this merge request

mentioned in commit 04204a5b

merged

mentioned in merge request !17 (merged)