Converted the server's managers to singletons
Minor code tweaks
Bugfixes, read more

* Manual modifications to the database caused the map to act unusual
* The server's packet must be created and deleted as a char array
* removed UnloadAll() from several singleton destructors
* added SDL_Delay() to BaseScene::RenderFrame(), to reduce heavy CPU use in menus
Removed delta time system from the framework
Split the ServerApplication's source into two files
Minor tweaks
Added the "package" target to the root makefile
Merge branch 'refactor-server' into develop

This is mostly just back end refactoring.