Cleanup|All Games: Removed dead code related to player controls

The g_ctrl.* files were not needed any more since libcommon handles
player control setup.
Cleanup|API: Removed all use of Con_Message, removed from public API

Also removed Con_PrintRuler. The libdeng2 C API now has a macro for
making escape codes (DE2_ESC).
Cleanup: Log entries, levels, and domains (continued)