fixed issue #1 (#2)

Create LICENSE

Delete LICENSE

Update README.md

Reduced use of global variables in entities of the engine

Added scaling for the actors inside rooms

Added behaviour to remove items from room when picked up

Added items' basic behaviour when right clicked

Moved function to compute new walk paths from main to the Actor class

Modified message system in Game class to have only one message at a time

Added few comments in Game class

Added deepcopy function for tables, corrected copy error in cutscenes system, changed cutscenes.lua structure

Added cutscenes system to execute scripts on entry in new rooms

Added descriptions in classes of the engine, moved player's definition file

Added item's behaviour when clicked with the left mouse button