WIP: Helpers keep default config for robustness

[Erwane]

It's a try to prevent addition in Cake helpers will break the code.

Bootstrap helper is in $helperConfig and merged to $_defaultConfig. This way, templates and widgets always have a correct default and follow framework.

Work in progress, need to do all helpers if good way.

[codecov[bot]]

Codecov Report

Merging #195 (96ef936) into cake4-bs4-1.0.0 (2767409) will increase coverage by 0.68%. The diff coverage is 73.33%.

@@                  Coverage Diff                  @@
##             cake4-bs4-1.0.0     #195      +/-   ##
=====================================================
+ Coverage              86.63%   87.32%   +0.68%     
- Complexity               380      382       +2     
=====================================================
  Files                     19       19              
  Lines                   1190     1183       -7     
=====================================================
+ Hits                    1031     1033       +2     
+ Misses                   159      150       -9     

Impacted Files	Coverage Δ	Complexity Δ
src/View/Helper/FormHelper.php	85.32% <73.33%> (+0.16%)	60.00 <24.00> (+2.00)
src/View/Widget/ColumnSelectBoxWidget.php	0.00% <0.00%> (ø)	3.00% <0.00%> (ø%)

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