Bubble docking adjustment (shiptest-ss13#2415)

Adjust mobile docking port to ensure east facing, added stationary
docking port.

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The Bubble lacked a docking port for shuttles, and would rotate in
flight.

Expanded map height (Y) by one to fit stationary dock. Added stationary
dock to south airlock for shuttle use:
![Weaver Lambda AB 2023-10-19
055811](https://github.com/shiptest-ss13/Shiptest/assets/14267245/0d8da4b2-a9f3-4de1-baf5-155ad3829a70)

Moved mobile dock to north pad and corrected `preferred_direction` (was
north!) and `port_direction`. This ensured east-facing during transit.

With the expanded map height (Y), Bubble map was now a square and would
land facing north. Expanded map length (X) to make it rectangular again,
and now it correctly lands facing east.

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Shuttle docking adds options. Consistent ship facing prevents issues.

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benefit the game. If you can't justify it in words, it might not be
worth adding. -->

:cl:
tweak: Bubble now consistently faces east
add: added Bubble subshuttle dock
/:cl:

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_maps/shuttles/independent/independent_bubble.dmm

@@ -650,13 +650,14 @@
 /turf/open/floor/plasteel/mono,
 /area/ship/hallway/central)
 "AR" = (
-/obj/machinery/door/airlock/external,
-/obj/docking_port/mobile{
-	launch_status = 0;
-	port_direction = 4
+/obj/docking_port/stationary{
+	width = 30;
+	height = 15;
+	dwidth = 15;
+	dir = 2
 	},
-/turf/open/floor/plating,
-/area/ship/engineering)
+/turf/template_noop,
+/area/space)
 "AU" = (
 /obj/machinery/cryopod{
 	dir = 4
@@ -955,6 +956,18 @@
 	},
 /turf/open/floor/plating/rust,
 /area/ship/maintenance/aft)
+"Nf" = (
+/obj/effect/turf_decal/industrial/warning{
+	dir = 1
+	},
+/obj/docking_port/mobile{
+	launch_status = 0;
+	port_direction = 8;
+	preferred_direction = 4;
+	dir = 2
+	},
+/turf/open/floor/plating,
+/area/ship/external)
 "NN" = (
 /obj/structure/frame/computer{
 	dir = 4
@@ -1278,6 +1291,7 @@ VB
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 (3,1,1) = {"
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 (4,1,1) = {"
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@@ -1430,6 +1451,7 @@ fs
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 (10,1,1) = {"
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@@ -1449,6 +1471,7 @@ kW
 nH
 NX
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 (11,1,1) = {"
 Xn
@@ -1468,9 +1491,10 @@ IL
 Vt
 Rk
 MJ
+VB
 "}
 (12,1,1) = {"
-gl
+Nf
 Gl
 ec
 nS
@@ -1486,6 +1510,7 @@ cH
 Ls
 ZQ
 cG
+ZQ
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 "}
 (13,1,1) = {"
@@ -1506,6 +1531,7 @@ UC
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+VB
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 (14,1,1) = {"
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@@ -1525,6 +1551,7 @@ MJ
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 (15,1,1) = {"
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@@ -1544,6 +1571,7 @@ zy
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 (16,1,1) = {"
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@@ -1563,6 +1591,7 @@ zy
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 (17,1,1) = {"
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@@ -1582,6 +1611,7 @@ VB
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 (18,1,1) = {"
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@@ -1601,4 +1631,25 @@ VB
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+"}
+(19,1,1) = {"
+VB
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+VB
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 "}