Feat/custom button layouts

[GoPro16]

trafficstars

This allows the layout prop to be dynamic based on whatever config a developer overwrites in the for theme.

If you have plans to implement this in a different way for custom themes let me know and I would love to collab to help extend the custom theme configs.

[codecov[bot]]

Codecov Report

Merging #36 (9aa1bc4) into master (b7afcfd) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #36   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           29        29           
  Lines          495       498    +3     
  Branches        77        80    +3     
=========================================
+ Hits           495       498    +3     

Flag	Coverage Δ
unittest	100.00% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/themes/default.ts	100.00% <ø> (ø)
src/Button.tsx	100.00% <100.00%> (ø)

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[kylepollina]

@estevanmaito can this be merged?