add CRASHREPORT directly to browser

add CRASHREPORT for Windows
add ^P info to report (via DUMPLOG)

new options: crash_email, crash_name, crash_urlmax
new game command: #bugreport
new config option: CRASHREPORT_EXEC_NOSTDERR
new command line option: --bidshow

deleted helper scripts:
    NetHackCrashReport.Javascript
    nhcrashreport.lua

misc:
    update CRASHREPORTURL (will need to be updated before release)
    update bitrot in winchain
    winchain for Windows
    add missing synch_wait for NetHackW --showpaths
    add PANICTRACE (and CRASHREPORT) in mdlib.c:build_opts

missing:
    packaging (Windows needs the pdb file)
    no testing with MSVC command line build

port status:
    linux: working, but glibc's backtrace doesn't show static functions
    Windows VS: working.  pdb file is large - looking into options
    MacOS: working
    msdos: not supported
    VMS: not supported
    MSVC: planned, but not attempted
    MSYS2: working, but libbacktrace not showing symbols (yet?)

sys/unix/hints/linux.370

@@ -291,11 +291,7 @@ VARDIR = $(HACKDIR)
 POSTINSTALL+= cp -n sys/unix/sysconf $(INSTDIR)/sysconf; \
 	$(CHOWN) $(GAMEUID) $(INSTDIR)/sysconf; \
 	$(CHGRP) $(GAMEGRP) $(INSTDIR)/sysconf; \
-	chmod $(VARFILEPERM) $(INSTDIR)/sysconf; \
-	( util/makedefs --grep-defined CRASHREPORT && \
-	  ( cp win/share/nhcrashreport.lua $(INSTDIR) ; \
-	  chmod 555 $(INSTDIR)/nhcrashreport.lua ; \
-	  cp $(LUATOP)/lua $(INSTDIR)/nhlua); true)
+	chmod $(VARFILEPERM) $(INSTDIR)/sysconf;
 
 ifneq "$(CCISCLANG)" ""
 # gdb may not be installed if clang is chosen compiler so the game