Basic UI layout/mechanics

Basic UIs with placeholder graphics have been created.

The main menu currently has two options; Play and Exit:

Selecting "Play" will take the player to the level select menu, seen below. The level select menu has room for four levels per page, and in the final version the level select screen will have options to change pages to view more levels. Currently the level select screen uses a development screenshot of the first level; it will not appear this way in future.

The basic in-game interface has been created. It currently does not support pausing or returning to the main menu, but will in future. In addition to resetting the time, the reset button also restarts the level in it's entirety.