added a console key (backquote, the key below escape) to enter commands like "add_units" or "victory"

From the manual: Backquote (the key below Escape): console command (only in single player mode). The only useful commands at the moment are add_units (to get units or buildings instantly) and victory (to win, for example to skip a chapter). Example of a "add_units" command: "add_units a1 100 archer".