Added keyword/actor collection/add function

Added the collections that will hold the keywords/actors associated with
a movie.

Also added the add function for both keywords/actors
Added hardcoded Customers

Added hardcoded Customers to the Cinema's customerCollection.
Added search functions/misc

Added: Actor/Keyword/Title search functions to Cinema
Added: Actor/Keyword search functions to Movie

Misc: Changed Movie's title and Actor's name to be stored as lowercase
letters (to make searching easier/more accurate)
Tested and Debugged searches