Feature mesh data for mixed facetypes

[Davknapp]

Implementation of the connectivity-maps, 'make_periodic' and 'uniform_mesh' for prisms.

[codecov[bot]]

Codecov Report

Merging #50 (67709d8) into dev (47fb897) will decrease coverage by 1.23%. The diff coverage is 46.66%.

:exclamation: Current head 67709d8 differs from pull request most recent head 3f5a2b3. Consider uploading reports for the commit 3f5a2b3 to get more accurate results

@@            Coverage Diff             @@
##              dev      #50      +/-   ##
==========================================
- Coverage   97.47%   96.23%   -1.24%     
==========================================
  Files          19       19              
  Lines        2016     2045      +29     
==========================================
+ Hits         1965     1968       +3     
- Misses         51       77      +26     

Impacted Files	Coverage Δ
src/connectivity_functions.jl	84.89% <38.46%> (-12.02%)	:arrow_down:
src/MeshData.jl	93.67% <100.00%> (-0.04%)	:arrow_down:
src/RefElemData.jl	94.62% <100.00%> (-2.16%)	:arrow_down:

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