Search Support and Tracking Improvements

• Added linter to the project (#64)
• Slather coverage reports (#70)
• Code coverage (#73)
• Search feature (#75)
• Added revenue parameter to track purchase calls (#76)
• Simplified search term validator + tests (#77)
• Order ID for Purchase (#81)
• Result Ids For Search Result Click, Autocomplete Select (#80)
• Reverted version fix (#79)
• Converted to Swift 5 (#83)
• Revert public changes (#84)
• Added baseURL property to config to allow baseURL customization - v2 (#85)