Add config to disable Requirements::customScript

[KINKCreative]

Adding a configuration to disable injecting the custom JavaScript code into the pages. Also added a custom ID to the Requirements::customScript, as per best practices, to allow blocking the requirement programatically.

My use case: I am including the silverstripe/elemental-flexslider but am using completely my own templates and all the frontend code. I have no way to exclude the custom JS required with this module. I also think a configuration is a simpler step than clearing the requirement.

[codecov]

Codecov Report

Merging #200 into 4 will decrease coverage by 0.57%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##                  4     #200      +/-   ##
============================================
- Coverage     54.64%   54.06%   -0.58%     
- Complexity       80       81       +1     
============================================
  Files             5        5              
  Lines           280      283       +3     
============================================
  Hits            153      153              
- Misses          127      130       +3

Flag	Coverage Δ	Complexity Δ
#php	54.06% <0%> (-0.58%)	81 <0> (+1)

Impacted Files	Coverage Δ	Complexity Δ
src/ORM/FlexSlider.php	68.75% <0%> (-1.9%)	21 <0> (+1)

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[muskie9]

Overall it works as expected, thanks! Just a couple updates noted.

[KINKCreative]

Would it be helpful to list the arbitrary ID of the custom script include in the docs, in case someone wants to block / update (? if possible) the requirement in their code.

[muskie9]

I think that's a great idea. Now that we have it, and there are clear use cases, it's worth noting for easy reference.

[muskie9]

Sorry, one other thing I just noticed. I believe this implementation will always return true, as it will return the full config for $this->owner. Updating to $this->owner->config()->get('clear_requirements') would have the expected result.