Initial check-in of RA (message command) emulation.

exec/ra_emu.src

+# ra_emu.src
+
+# Emulate RemoteAccess, Renegade, etc. Mail/Message Prompts
+
+# $id$
+
+# @format.tab-size 8, @format.use-tabs true
+
+!include sbbsdefs.inc
+
+or _sys_misc SM_RA_EMU