Delayed lobby start (#4184)

Resolves #4169

## Description:

Adds a delayed lobby start option.
Utilizes the same system as for public lobbies.
The default for the option is for lobbies to take 3 seconds to start,
however this can easily be changed.

The current setting is controlled through an enable-disable slider,
however there are multiple other options for how to control this.
For example we could do a slider, an input field, a dropdown etc. And i
dont necessarily know if the currently implemented option is the best.

Furhtermore im not sure if i have used the language file completely
correctly. There is now a duplicate field for both private and public
lobby. However there is not category shared between the two. So i
decided to reuse the field from public for private games, as this
simplified the code a bit.

**Host video**

https://github.com/user-attachments/assets/6f3db6e4-7323-4fad-8544-efb8cef4d969

**Non-host video**

https://github.com/user-attachments/assets/ee02a072-1f42-4dde-a5d9-120fda862eb7

## Please complete the following:

- [X] I have added screenshots for all UI updates
- [X] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory


## Please put your Discord username so you can be contacted if a bug or
regression is found:
FrederikJA

resources/lang/en.json

@@ -704,8 +704,11 @@
     "random_spawn": "Random spawn",
     "remove_player": "Remove {username}",
     "start": "Start Game",
+    "start_delay": "Start delay (Seconds)",
+    "start_delay_placeholder": "3",
     "starting_gold": "Starting Gold (Millions)",
     "starting_gold_placeholder": "5",
+    "starting_in": "Starting in {time}. Click to cancel",
     "team_count": "Number of Teams",
     "teams_Duos": "Duos (teams of 2)",
     "teams_Humans Vs Nations": "Humans vs Nations",