Improves selector targeting and header matching logic#564

CSWinnall wants to merge 1 commit intodevcortexrd/Knack-Toolkit-Library:devfrom

fix/-Ktl-Target-when-adding-our-own-checkboxescortexrd/Knack-Toolkit-Library:fix/-Ktl-Target-when-adding-our-own-checkboxesCopy head branch name to clipboard