Menu and Location Persistence

Created a basic main menu with options to save and load a single file.   

Created an inventory limit of 10 items.  In the future, I want to add variability in the amount of items that each character can carry.  

Added a zoom feature.  Use the scroll wheel to zoom out to see what you've explored. 

Implemented location persistence.  Now, when you re-visit a location (a tile in the world map) your previous interactions with that location remain.  Any tiles that you have previously explored will remain explored.  Also, if you traded with the merchants in the area, the items each merchant has will persist until the next time you visit.  So, if you take all of the items out of a location, there won't be any items there the next time you visit.  I the future, I want to add a work system, where the merchants can create new items based on their jobs.