Bigger Tent

I have added a larger tent that has 3x3 squares of space on the inside, and takes up a total of 5x5 tiles of space when set up. The item has 40 volume, making it very bulky. Specifically, I have added a new iuse function for the tent, as well as a two new furniture objects for the groundsheet, and a new iexamine function that enables the player to take down the tent by examining a groundsheet and receive a large tent.

The large number of files changed is because I ended up updating the clean source code while the branch was still being worked on, causing them to show up in the commit history. Ctrl-F'ing for "f_large_groundsheet", "f_center_groundsheet", and "large tent" should show my commits. If this is not acceptable, I will go back and try to clean everything up.