Implement fuzzy string searching

[scripthunter7]

There are cases where something is just misspelled, like the modifier name: scipt instead of script. In this case, the provided modifier name is very similar to the name of the original modifier. If we find an invalid modifier name, it might be worth doing a fuzzy string searching to find the correct modifier name from the set of known modifier names (spell checkers also use similar algorithms). Later, we may recommend this as an optional fix via the suggestion API.

Possible use cases:

• modifier names
• CSS pseudo class names
• scriptlet names
• redirect names
• pre-processor directive names
• hints, platforms
• expression variable names in !#if comments
• domain TLDs
• etc.

References, links to check:

• https://en.wikipedia.org/wiki/Approximate_string_matching
• https://en.wikipedia.org/wiki/Levenshtein_distance
• https://github.com/EthanRutherford/fast-fuzzy