Added the history command

Added the "history" command to see a list of commands used before.

```
msf exploit(handler) > history -n 4
2344  set PAYLOAD windows/meterpreter/reverse_tcp
2345  set LHOST 10.0.1.109
2346  exploit
2347  history -n 4
msf exploit(handler) > history -h
Usage: history [options]

Show the command history


OPTIONS:

    -a        Show length commands in history
    -h        Help banner.
    -n <opt>  Show the last n commands

msf exploit(handler) > 
```

lib/msf/ui/console/command_dispatcher/core.rb

@@ -85,7 +85,10 @@ class Core
     "-k" => [ true,  "Keep (include) arg lines at start of output."   ],
     "-c" => [ false, "Only print a count of matching lines."          ])
 
-
+  @@history_opts = Rex::Parser::Arguments.new(
+    "-h" => [ false, "Help banner."                                   ],
+    "-a" => [ false, "Show all commands in history"                ],
+    "-n" => [ true, "Show the last n commands"                       ])
 
   @@irb_opts = Rex::Parser::Arguments.new(
     "-h" => [ false, "Help banner."                                   ],
@@ -105,6 +108,7 @@ class Core
       "getg"       => "Gets the value of a global variable",
       "grep"       => "Grep the output of another command",
       "help"       => "Help menu",
+      "history"    => "Show commands history",
       "irb"        => "Drop into irb scripting mode",
       "load"       => "Load a framework plugin",
       "quit"       => "Exit the console",
@@ -473,6 +477,43 @@ class Core
 
   alias cmd_quit cmd_exit
 
+
+  def cmd_history(*args)
+    
+    limit = 100
+    length = Readline::HISTORY.length 
+
+    @@history_opts.parse(args) do |opt, _idx, val|
+      case opt
+      when "-a"
+        limit = length
+      when "-n"
+        return cmd_history_help unless val.match /\A[-+]?\d+\z/
+        limit = val.to_i
+        limit = length if limit >= length
+      when "-h"
+        cmd_history_help
+        return false
+      end
+    end
+
+    start = length - limit 
+    (start..length-1).each do |pos|
+      print "#{pos}  #{Readline::HISTORY[pos]}\n"
+    end
+  end
+
+  def cmd_history_help
+    print_line "Usage: history [options]"
+    print_line
+    print_line "Shows the command history."
+    print_line "If -n is not set, it will only be shown the last 100 commands"
+    print_line
+    print @@history_opts.usage
+  end
+
+
+
   def cmd_sleep_help
     print_line "Usage: sleep <seconds>"
     print_line