illumos gate

Port following changes to loader:

13920 support for hiding the cursor on the console
13921 tem could support longer attribute chains

Add forth words

\ set cursor invisible or normal (civis/cnorm)
: cursor-invisible ( -- ) [char] l ;
: cursor-normal ( -- ) [char] h ;
: cursor-set ( cursor-mode -- ) escc [char] ? emit 25 .# emit ;

So we can hide cursor while drawing menu.