PetscFE simplex quadrature

This will select efficient (symmetric) quadrature by default for simplices (@tisaac in !5509 (merged)).

It's currently Draft status because I don't know how to interpret diffs like this

not ok diff-dm_dt_fe_tests-ex3_p1_1+func-trig # Error code: 1
#       1,3c1,3
#       < Interpolation tests FAIL at tolerance 1e-10 error 4.96655
#       < L_2 convergence rate: 2.7
#       < L2 projection tests FAIL at tolerance 1e-10 error 0.816497
#       ---
#       > Interpolation tests FAIL at tolerance 1e-10 error 2.12132
#       > L_2 convergence rate: -38.
#       > L2 projection tests pass at tolerance 1e-10

It seems to me like this causes projection tests to pass and thus is an improvement. @knepley can you please advise?