Improve data.loader.php and aru.php

[Obihoernchen]

Right now there is a lot of duplicate code.
We should improve this.

• Don't build html content in aru.php but pass json and replace content with JS
• use templates

[SiteEffect]

I also don't fully understand aru.php. On the one hand it gets called every few seconds and re-writes variables initially written in in data.loader.php - so there has to be a lot of duplicate code!? On the other hand, I see that it is partly called by .js Scripts/Functions for updating on the fly. What is the procedure's cycle exactly?

[Obihoernchen]

Yes it's exactly as you described.
But we can avoid a lot of duplicate code if we will make one file for initial loading and updates. Or make another php class with functions we can import in both files. Something like this.

Writing the same SQL statement or HTML code twice in two different files is bad :/

[SiteEffect]

I am in for a mix of those because we have a better overview what happens on what page because of the cases in one load+update file while we have update-functions stored somewhere else - so inside each of those cases we should load first and then call an update function in the desired interval.

[AL-dot-debug]

ARU should be called only by AJAX request ( ARU = Ajax Return Unit )