Patch v1.1.6

Release Notes: [list] [*]Optimized: AI is cleverer when steering clear of the obstacles; [*]Optimized: some upgrade icons; [*]Fixed: when Bow is killed, her Focus Fire effect will no longer stay; [*]Fixed: the item shop no longer sells the Slowmo Time and the ultimate weapons; [/list] [b]This patch does not include the OSX version.[/b] I'm travelling with a PC laptop so I can only build the Windows and Linux versions. The patch for the OSX will be included in the next version. Sorry for everything!