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/Makefile.top

@@ -112,7 +112,7 @@ LUA2NHTOP = ../../..
 LUABASELIB = liblua-$(LUA_VERSION).a
 TOPLUALIB = lib/lua/$(LUABASELIB)
 
-ALLDEP = $(GAME) recover Guidebook $(VARDAT) spec_levs check-dlb check-nhlua
+ALLDEP = $(GAME) recover Guidebook $(VARDAT) spec_levs check-dlb
 
 # first target is also the default target for 'make' without any arguments
 all:    $(ALLDEP)
@@ -148,10 +148,6 @@ luabin:
 	( cd $(LUATOP) \
 	  && make $(LUAMAKEFILES) all && cd $(LUA2NHTOP) )
 
-check-nhlua:
-	( util/makedefs --grep-defined CRASHREPORT && ( \
-	  cd $(LUATOP) && make $(LUAMAKEFLAGS) ); true )
-
 # hints file could set LUATESTTARGET to this if GITSUBMODULES is defined
 submodules/lua/lua.h:
 	git submodule init submodules/lua