Enhance search functionality using Advanced Filter API etc #18

Since this visual was built, new Filter features have become available e.g. Advanced Filter API:
https://docs.microsoft.com/en-us/power-bi/developer/visuals/filter-api#the-advanced-filter-api

This visual could be greatly improved by implementing those, e.g.

• implement "and" functionality by default e.g. if the user enters "word1 and word2". It currently matches that as one string
• implement "or" functionality, e.g. if the user enters "word1 or word2"
• implement the various "Condition Operators" eg DoesNotContain - probably best as a format property