Improve Qt libraries loading mechanism (QtLoader Java classes)

Look into what can be improved in the loading mechanism of Qt libraries. At the moment, the loading is done under the QtActivity or QtService, and done each time for each activity/service if there are multiples declared. And if multiples are declared, the mechanism might fails.

This task should look into improving that by for example moving that logic into the QtApplication so it's done only once and activities/services don't need to redo that each time. That also could give the benefit or improved architecture and code.