Allow system to be enabled from management page

[Jamiras]

Without having to deploy anything.

Note: this just updates the menu and the isValidConsole checks to read from the database instead of a config file.

The download page still requires new emulators to be registered in the releases.php file. New console IDs can be added to existing emulators and will be hidden until the console is activated.

SQL to get DB in sync with seed file:

UPDATE Console SET manufacturer='Microsoft' where ID=26;
UPDATE Console SET order_column=1 WHERE ID IN (4,12,25,33,8,56,34,54,29,31,64);
UPDATE Console SET order_column=2 WHERE ID IN (6,21,50,11,76,14,30,55,26,59,52);
UPDATE Console SET order_column=3 WHERE ID IN (5,41,51,15,67,22,35);
UPDATE Console SET order_column=4 WHERE ID IN (7,36,1,47);
UPDATE Console SET order_column=5 WHERE ID IN (3,17,9,48);
UPDATE Console SET order_column=6 WHERE ID IN (2,77,10,49);
UPDATE Console SET order_column=7 WHERE ID IN (16,13,39);
UPDATE Console SET order_column=8 WHERE ID IN (19,40);
UPDATE Console SET order_column=9 WHERE ID IN (20,68);
UPDATE Console SET order_column=10 WHERE ID IN (18);
UPDATE Console SET order_column=11 WHERE ID IN (78);
UPDATE Console SET order_column=12 WHERE ID IN (62);
UPDATE Console SET order_column=13 WHERE ID IN (24);
UPDATE Console SET order_column=14 WHERE ID IN (60);
UPDATE Console SET order_column=15 WHERE ID IN (28);
UPDATE Console SET active=1 WHERE ID IN (16,71,72,73,74,75,76,77,78,80,102);

[wescopeland]

I've tested activating/deactivating various systems to confirm behavior through the various code changes is functioning correctly.

There's nothing in these changes that leaps out to me as a cause for concern. For the noted redundant queries, we'll inevitably clean that stuff up as the UI continues to evolve, especially with a future move to Inertia+React.