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?)

win/chain/wc_chainin.c

@@ -108,7 +108,7 @@ chainin_procs_chain(
         tdp->nprocs = 0;
         tdp->ndata = 0;
         tdp->linknum = n;
-        cibase = 0;
+        cibase = tdp;
         break;
     case WINCHAIN_INIT:
         tdp = me;
@@ -584,7 +584,7 @@ chainin_ctrl_nhwindow(
     int request,
     win_request_info *wri)
 {
-    boolean rv;
+    win_request_info *rv;
 
     rv = (*cibase->nprocs->win_ctrl_nhwindow)(cibase->ndata, window,
                                                    request, wri);
@@ -609,7 +609,7 @@ struct window_procs chainin_procs = {
     chainin_display_nhwindow, chainin_destroy_nhwindow, chainin_curs,
     chainin_putstr, chainin_putmixed, chainin_display_file,
     chainin_start_menu, chainin_add_menu, chainin_end_menu,
-    chainin_select_menu, chainin_message_menu, chainin_update_inventory,
+    chainin_select_menu, chainin_message_menu,
     chainin_mark_synch, chainin_wait_synch,
 #ifdef CLIPPING
     chainin_cliparound,