feat!: switch to SpatRaster

[gisler]

No description provided.

[codecov-commenter]

Codecov Report

Merging #20 (285aa11) into main (3f73ceb) will decrease coverage by 0.34%.
The diff coverage is 80.40%.

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@@            Coverage Diff             @@
##             main      #20      +/-   ##
==========================================
- Coverage   67.46%   67.13%   -0.34%     
==========================================
  Files          13       12       -1     
  Lines        1208     1214       +6     
==========================================
  Hits          815      815              
- Misses        393      399       +6     

Files	Coverage Δ
R/GOFmetrics.R	100.00% <100.00%> (ø)
R/RPhosFate.R	100.00% <100.00%> (ø)
R/assertives.R	100.00% <100.00%> (ø)
R/gettersSetters.R	100.00% <ø> (ø)
R/interface.R	70.65% <100.00%> (+1.16%)	⬆️
R/utils.R	81.37% <100.00%> (-1.52%)	⬇️
src/dir_sth.cpp	100.00% <100.00%> (ø)
R/aaa.R	98.07% <77.77%> (+0.96%)	⬆️
src/D8slope.cpp	0.00% <0.00%> (ø)
R/input.R	5.16% <0.00%> (-0.27%)	⬇️