Convert all numbers to Float64 internally

[DanielVandH]

Closes #73

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.03% 🎉

Comparison is base (4167b51) 93.44% compared to head (c498c41) 93.48%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #75      +/-   ##
==========================================
+ Coverage   93.44%   93.48%   +0.03%     
==========================================
  Files          73       73              
  Lines        5450     5446       -4     
==========================================
- Hits         5093     5091       -2     
+ Misses        357      355       -2     

Files Changed	Coverage Δ
src/data_structures/refinement/refinement_queue.jl	95.00% <100.00%> (+3.33%)	⬆️
src/data_structures/statistics.jl	78.26% <100.00%> (-0.38%)	⬇️
src/data_structures/voronoi/voronoi.jl	80.31% <100.00%> (ø)
src/geometry_utils/intersections.jl	97.08% <100.00%> (ø)
src/geometry_utils/polygons.jl	100.00% <100.00%> (ø)
src/geometry_utils/polylabel.jl	100.00% <100.00%> (ø)
src/interfaces/points.jl	94.38% <100.00%> (+0.19%)	⬆️
src/point_location/initialisers.jl	96.94% <100.00%> (ø)
src/predicates/general.jl	98.08% <100.00%> (ø)
src/refinement/encroachment.jl	98.11% <100.00%> (ø)
... and 6 more

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