LocatorForm - allow Fields() to be extended

[jsirish]

No description provided.

[codecov]

Codecov Report

Merging #177 into master will increase coverage by 0.36%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##             master    #177      +/-   ##
===========================================
+ Coverage     72.54%   72.9%   +0.36%     
- Complexity       82      83       +1     
===========================================
  Files             7       7              
  Lines           295     299       +4     
===========================================
+ Hits            214     218       +4     
  Misses           81      81

Impacted Files	Coverage Δ	Complexity Δ
src/form/LocatorForm.php	78.94% <100%> (+2.47%)	10 <1> (+1)	⬆️

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