Don't call it "The Core" - that's still MyBB!
Add recursive array escaping and move short functions to their own file
Escape everything with our nice recursive functions
Make use of the singleton classes for MyAlerts hopefully added soon
Adding ACP Module Class - handles acp menus and modules

Also fixed two bugs:
- The autoloader searched in the wrong directory if subdirs were used
- The alerts bridge triggered errors if MyAlerts was present but not installed
Fixes another set of issues with MyAlerts
Make use of the 'myalerts_is_activated' function instead writing our own
New requirement: core version
Fix updater naming, bump version and add parameters to the install function
Version 0.5 has been finished
Merge branch 'development'