Add new universal crash handlers and error reporting screen. (#5804)

* Add new crash handler and error reporting screen.

* Minor cleanup.

* Word choice.

* Rename `SafeCrashStage` to `CrashHandlingStage`.

* Reviews.

* Reference stack traces in comments for thread and postRunnable exceptions.

* Remove excessive line breaks, superfluous .apply{}.

android/assets/jsons/translations/template.properties

@@ -34,6 +34,17 @@ See your stats breakdown!\nEnter the Overview screen (top right corner) >\nClick
 Oh no! It looks like something went DISASTROUSLY wrong! This is ABSOLUTELY not supposed to happen! Please send me (yairm210@hotmail.com) an email with the game information (menu -> save game -> copy game info -> paste into email) and I'll try to fix it as fast as I can! = 
 Oh no! It looks like something went DISASTROUSLY wrong! This is ABSOLUTELY not supposed to happen! Please send us an report and we'll try to fix it as fast as we can! = 
 
+# Crash screen
+
+An unrecoverable error has occurred in Unciv: = 
+If this keeps happening, you can try disabling mods. = 
+You can also report this on the issue tracker. = 
+Copy = 
+Error report copied. = 
+Open Issue Tracker = 
+Please copy the error report first. = 
+Close Unciv = 
+
 # Buildings
 
 Unsellable =