Add script command navigateto. Add packet for this command.

Based on rAthena commits:
commit 4f13007fec7f08c265620a71c3bc4806d186c0f1
Author: Lemongrass3110 <lemongrass@kstp.at>
Date:   Sun Mar 6 21:48:47 2016 +0100

commit 809f220b9f5ef70ee062ee56ae6e8d5f56cb5d32
Author: aleos89 <aleos89@users.noreply.github.com>
Date:   Sun Mar 6 16:15:54 2016 -0500

commit 179f73424934d528ebe494dfb66503c182eacb09
Author: aleos89 <aleos89@users.noreply.github.com>
Date:   Sun Mar 6 16:10:15 2016 -0500

1 files changed, 33 insertions, 0 deletions

diff --git a/doc/script_commands.txt b/doc/script_commands.txt
index 04d2c0c16..eb7e0cd9d 100644
--- a/doc/script_commands.txt
+++ b/doc/script_commands.txt
@@ -7204,6 +7204,39 @@ Example:
 	movenpc("Bugga", 100, 20);
 
 ---------------------------------------
+
+*navigateto("<map>"{,<x>,<y>,<flag>,<hide_window>,<monster_id>,<char_id>});
+
+Generates a navigation for attached or specified character. Requires client
+2011-10-10aRagEXE or newer.
+
+The flag specifies how the client will calculate the specific route.
+
+Valid flags are:
+ NAV_NONE - No services
+ NAV_AIRSHIP_ONLY - Airship only
+ NAV_SCROLL_ONLY - Scroll only
+ NAV_AIRSHIP_AND_SCROLL - Airship and Scroll
+ NAV_KAFRA_ONLY - Kafra only
+ NAV_KAFRA_AND_AIRSHIP - Kafra and Airship
+ NAV_KAFRA_AND_SCROLL - Kafra and Scroll
+ NAV_ALL - All services
+
+When flag is not specified, the default value is NAV_KAFRA_AND_AIRSHIP.
+
+The hide_window specifies whether to display (0) or hide (1) the navigation window.
+By default the window is hidden.
+
+You can specify the monster_id in combination with a mapname to make the
+navigation system tell you, that you have reached the desired mob.
+
+Note:
+The client requires custom monster spawns be in the navigation file
+for using the embedded client Navigation feature to work properly. In this
+instance sending the player to the map where the monster spawns is a simpler
+solution rather than sending the map and the monster_id.
+
+---------------------------------------
 //=====================================
 6 - Other Commands
 //=====================================