Add Note severity and changes UI of administrative notes (#39808)

* Adds note_severity and updates dbconfig. New SQL stuff too.

* whoops please don't hack into my database >:^(

* UI change, changed how it's stored in the DB, removed some queries when it returns, changed stuff to key.

* Update sql_message_system.dm

* this was not defined

* random indent

* wait how did this get here

* okay enough web edits I promise

* just kidding I got u

* Update common.css

* Added buttons, changed UI again, standardized the inputs, added severity for appearance bans, fed the dog

* forgot about the banning panel

* added an asset cache

* corrects asset datum var name

code/__DEFINES/subsystems.dm

@@ -1,7 +1,7 @@
 //Update this whenever the db schema changes
 //make sure you add an update to the schema_version stable in the db changelog
 #define DB_MAJOR_VERSION 4
-#define DB_MINOR_VERSION 6
+#define DB_MINOR_VERSION 7
 
 //Timing subsystem
 //Don't run if there is an identical unique timer active