feature: first view, first load feature

[timomayer]

make it possible that the resurceloader loads and executes resources first which are "above the fold" so visible in the first viewport a user sees and load the rest of the page afterwards in addition to:
#164

[ctmm]

As it stands, the resource loader will add resources to the loading queue based on their order in the DOM.

Please note that this does not mean we have implemented prioritisation of resources.