Preparing for options hiding.
In cOpt class:
 Added new var 'hide'
 Added new method is_hidden()
Pretty simple.
Changed default constructors of cOpt
 Now they accept optional copt_hide_t var.
 Default value is COPT_NO_HIDE which means no hidding on default.
 Other possible values:
  COPT_SDL_HIDE - Hide on SDL build.
  COPT_CURSES_HIDE - Hide on curses build.
Don't show hidden option in menu
Hide unneeded options
Small warnings fixes
Merge branch 'options-hide' of https://github.com/VlasovVitaly/Cataclysm-DDA into VlasovVitaly-options-hide
fix int call