CMSS Lobby Screen (#17581)

* Establish base working new_player tgui

* Tweak to fit virgo

* .

* fix that

* split that

* no as import

* clean up old code

* .

* .

---------

Co-authored-by: Kashargul <144968721+Kashargul@users.noreply.github.com>

code/modules/tgui/tgui.dm

@@ -47,6 +47,8 @@
 	var/list/children = list()
 	/// Any partial packets that we have received from TGUI, waiting to be sent
 	var/partial_packets
+	/// If the window should be closed with other windows when requested
+	var/closeable = TRUE
 
 /**
  * public
@@ -60,13 +62,13 @@
  * optional parent_ui datum/tgui The parent of this UI.
  * optional ui_x int Deprecated: Window width.
  * optional ui_y int Deprecated: Window height.
+ * optional window datum/tgui_window: The window to display this TGUI within
  *
  * return datum/tgui The requested UI.
  */
-/datum/tgui/New(mob/user, datum/src_object, interface, title, datum/tgui/parent_ui, ui_x, ui_y)
+/datum/tgui/New(mob/user, datum/src_object, interface, title, datum/tgui/parent_ui, ui_x, ui_y, datum/tgui_window/window)
 	src.user = user
 	src.src_object = src_object
-	src.window_key = "[REF(src_object)]-main"
 	src.interface = interface
 	if(title)
 		src.title = title
@@ -78,6 +80,12 @@
 	if(ui_x && ui_y)
 		src.window_size = list(ui_x, ui_y)
 
+	if(window)
+		src.window = window
+		src.window_key = window.id
+	else
+		src.window_key = "[REF(src_object)]-main"
+
 /datum/tgui/Destroy()
 	user = null
 	src_object = null
@@ -88,22 +96,26 @@
  *
  * Open this UI (and initialize it with data).
  *
+ * Args:
+ * preinitialized: bool - if TRUE, we will not attempt to force strict mode on the tgui's window datum
+ *
  * return bool - TRUE if a new pooled window is opened, FALSE in all other situations including if a new pooled window didn't open because one already exists.
  */
-/datum/tgui/proc/open()
+/datum/tgui/proc/open(preinitialized = FALSE)
 	if(!user?.client)
 		return FALSE
-	if(window)
+	if(window && window.status > TGUI_WINDOW_LOADING)
 		return FALSE
 	process_status()
 	if(status < STATUS_UPDATE)
 		return FALSE
-	window = SStgui.request_pooled_window(user)
+	if(!window)
+		window = SStgui.request_pooled_window(user)
 	if(!window)
 		return FALSE
 	opened_at = world.time
 	window.acquire_lock(src)
-	if(!window.is_ready())
+	if(!window.is_ready() && !preinitialized)
 		window.initialize(
 			strict_mode = TRUE,
 			fancy = user.read_preference(/datum/preference/toggle/tgui_fancy),