Allow ESC key to open system menu on x11.
fix copyright of x11-term.h, since its lines are just moved from main-x11.c.
Remove x11 selection code that will not be used.
Add return values to the x11 load pref() and save_pref() functions.
Add ability to show high scores from windows menu, by pressing "s".
start changing file handling to match angband.
Reduce a script block size to under 1024 characters.
use a modified version of Angband,s z-file.c/.h
use u64b instead of _u64b in run code and also use UINT64_C to define 64bit run constants.