Vueui based modular computers (#5249)

Fixes up VueUi not tested functions and badly designed data push flow.
Port main screen in VueUI
Port configuration
Port device management

code/modules/modular_computers/file_system/program.dm

@@ -174,7 +174,6 @@
 /datum/computer_file/program/proc/get_header_data()
 	if(computer)
 		return computer.get_header_data()
-	return list()
 
 // This is performed on program startup. May be overriden to add extra logic. Remember to include ..() call. Return 1 on success, 0 on failure.
 // When implementing new program based device, use this to run the program.