Rename internal HtmLawed, reduce CS diff and upgrade it

[mvorisek]

now the patching is easier and better documented

improve 7108caa for easier long term maintenance/upgrades

[mvorisek]

@AllanJard and this one please as well

effective changes:

ecb0f16...ccb3e67 - minor upgrade changes

a753f3c...18c3d78 - is the new/official config [1] fine or was the config patched historically for DataTable Editor?

[1] https://github.com/vanilla/htmlawed/blob/v2.2.15/src/Htmlawed.php#L14

[AllanJard]

I'll need to test this one fully before pulling it in (the case change might impact the non-composer loader). Hopefully that will be within the next week. I think there was a small patch for the config to allow data attributes or something like that, but I'll check that as well.

Many thanks for this.