Add clear search functionality

[zisiszikos]

Problem:
After completing a search, there is no way to revert to the initial state and view, and the last element is still highlighted. Even if an undefined value is passed as a parameter at the search function, it still returns an iterator that matches some value.

Possible solutions:

• Reset the view at the initial state if no value is passed at the search function.
• Introduce clearSearch function that resets the view at its initial state.