[Suggestion] Handle references to APIs outside the project

[Ultrahead]

For cases where one includes custom .bas/.zxbas files outside the project, like this ...

#include "../../../Helpers/SpriteHelpers.zxbas"

... it would be handy if we can count on a "References" folder where one can add shortcuts to said files. In order to do that, the type of shortcuts should be handled by the IDE (in all supported platforms).

For example ...

Adding such a feature would ease situations when you need to access said files with ZXBS to adjust the code in there.