offsets

[jkrumbiegel]

• add offset field, size field, change nrow/ncol
• fix offset bugs

[codecov-commenter]

Codecov Report

Merging #29 (28b68a6) into master (d19bdf5) will decrease coverage by 0.27%.
The diff coverage is 90.22%.

@@            Coverage Diff             @@
##           master      #29      +/-   ##
==========================================
- Coverage   87.17%   86.89%   -0.28%     
==========================================
  Files           7        7              
  Lines        1318     1351      +33     
==========================================
+ Hits         1149     1174      +25     
- Misses        169      177       +8     

Impacted Files	Coverage Δ
src/GridLayoutBase.jl	100.00% <ø> (ø)
src/precompile.jl	0.00% <ø> (ø)
src/helpers.jl	75.60% <71.42%> (-0.87%)	⬇️
src/gridlayout.jl	91.73% <92.37%> (-0.46%)	⬇️
src/types.jl	100.00% <100.00%> (ø)

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