Utilities: Increase max spacing/gap to 20 from 16

[danielchalmers]

Description

80px up from 64px.
Resolves #8942
MudForm now allows gap-0
MudStack no longer allows negative gap which was invalid and adds more documentation

Not sure if I missed any.

How Has This Been Tested?

Type of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation (fix or improvement to the website or code docs)

Checklist

• The PR is submitted to the correct branch (dev).
• My code follows the code style of this project.
• I've added relevant tests.

[danielchalmers]

20 was suggested by @henon due to Bootstrap only offering up to 20, Vuetify the same

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.45%. Comparing base (28bc599) to head (a0e5476).
Report is 177 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #8943      +/-   ##
==========================================
+ Coverage   89.82%   90.45%   +0.62%     
==========================================
  Files         412      419       +7     
  Lines       11878    12190     +312     
  Branches     2364     2380      +16     
==========================================
+ Hits        10670    11026     +356     
+ Misses        681      630      -51     
- Partials      527      534       +7     

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[henon]

I did misremember. Vuetify offers only up to 16. But Bootstrap offers up to 20 and is used by so many that I guess it is a good idea to orient ourselves after them with respect to these classes.

[henon]

Does it increase padding utility classes also? i.e. pa-20 ?

[danielchalmers]

Does it increase padding utility classes also? i.e. pa-20 ?

@henon Yes, they're listed under Spacing

[henon]

Thanks!