Module Finder - `Select Modules for Timetable` functionality
Module Finder - `Select Modules for Timetable` functionality

This is a preliminary implementation of this functionality in nusmods.com
There are still some adjustments we need to make, such as:
1. Displaying the `Select Modules for Timetable` text when no module is
   selected
2. Show `Selected X Module(s)` and the `(Clear All)` option when at least one
   module is being selected

Signed-off-by: Pang Yan Han <22594c345857f664c61cd411f607c4d40a9d4af9@gmail.com>

yanhan/cljs-nusmods,yanhan/cljs-nusmods,yanhan/cljs-nusmods