allow symbolic arguments for some commands

* new command "listoptions" lists the argument options for several
  argument types like entities, weapons and teamnames
* "burstshots", "weapon", "magcontent", "magreserve", "fragmessage" and
  "gibmessage" now allow guns to be specified by name
* "addpunct" allows plaintext arguments like "brackets" and "quotes"
* the "team" command now understands numeric teams
* entity types can now be specified by type index number
* removed some lists from the config files (now provided by listoptions)
* added argument completion for several commands
* change nextprimary from integer to string variable

DOCREF listoptions burstshots weapon addpunct
DOCREF fragmessage gibmessage magcontent magreserve
DOCREF nextprimary

source/src/main.cpp

@@ -1062,6 +1062,9 @@ int main(int argc, char **argv)
     if(bootclientlog) cvecprintf(*bootclientlog, "######## start logging: %s\n", timestring(true));
 
     const char *initmap = rndmapname();
+    loopi(NUMGUNS) gunnames[i] = guns[i].modelname;
+    gunnames[GUN_AKIMBO] = "akimbo";
+    gunnames[NUMGUNS] = "";
 
     pushscontext(IEXC_CFG);