Replace Vec3f0 with Vec3f, FRect3D with Rect3f

[knuesel]

This switches to new GeometryBasics type names from JuliaGeometry/GeometryBasics.jl#97.

[knuesel]

This should be ready for merge now.

[codecov]

Codecov Report

Merging #74 (5ee9466) into master (fe89c97) will not change coverage.
The diff coverage is 90.90%.

@@           Coverage Diff           @@
##           master      #74   +/-   ##
=======================================
  Coverage   93.44%   93.44%           
=======================================
  Files           8        8           
  Lines         412      412           
=======================================
  Hits          385      385           
  Misses         27       27           

Impacted Files	Coverage Δ
src/MeshIO.jl	100.00% <ø> (ø)
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)
src/io/off.jl	100.00% <100.00%> (ø)
src/io/ply.jl	100.00% <100.00%> (ø)
src/io/stl.jl	96.42% <100.00%> (ø)

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