added liveloading to the search bar result count

[mhsh312]

Fixes #2614

Changes:

• Added the functionality of live loading as mentioned in Live Loading of 'Find' Results #2614 by adding the ability to update the UI in the startSearch function
• handled the edge case of changing the entire input field at once by selecting the test using cursor.findNext() 
• handled code highlighting and de-highlighting in live loading as well

searchFix.mp4

I have verified that this pull request:

• has no linting errors (npm run lint)
• has no test errors (npm run test)
• is from a uniquely-named feature branch and is up to date with the develop branch.
• is descriptively named and links to an issue number, i.e. Fixes #123

[lindapaiste]

This is great, thank you! 🥇