* contrib/hbgs/core.c
! fixed to build with new GS versions - fix borrowed from Viktor's
branch
* src/rtl/setkey.c
+ in hb_SetKey() and hb_SetKeyCheck() if extended keycode is passed
and does not have associated action check also for actions bound
with corresponding standard keycode
! honor user parameters passed by reference to hb_SetKeyCheck()
! fixed hardcoded 4 parameter limit in hb_SetKeyCheck()
* src/compiler/hbopt.c
! fixed 'assigned but not used' warning detection - it should not
mark initial HB_P_PUSHLOCALREF PCODE as used when next <op>=
operation leaves result on HVM stack.
* optimize 'var <op>= 0', 'var <op>= 1' and 'var <op>= <timestamp>'
operations
* small cleanup
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