Consider point/normal/uvtype in parsing 2DM, MSH and OBJ

[GerhardHippmann]

• 2DM: pointtype
• MSH: pointtype
• OBJ: pointtype, normaltype and uvtype

#77

[codecov]

Codecov Report

Merging #78 (d473222) into master (e2f20a4) will not change coverage.
The diff coverage is 83.33%.

@@           Coverage Diff           @@
##           master      #78   +/-   ##
=======================================
  Coverage   93.17%   93.17%           
=======================================
  Files           8        8           
  Lines         410      410           
=======================================
  Hits          382      382           
  Misses         28       28           

Impacted Files	Coverage Δ
src/io/obj.jl	96.77% <75.00%> (ø)
src/io/2dm.jl	89.65% <100.00%> (ø)
src/io/msh.jl	96.77% <100.00%> (ø)

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[sjkelly]

Thanks!