Issue 64 add theme selection menu

[Toeffe3]

Purpose: Exploring theme selection options

Trying different methods to select theme color

Approach

Write css and rearrange HTML until a feasible design is acomplished

Testing steps to find bugs or errors in added code.

1. Login
2. Goto settings
3. Press/drag icons/button/slider

[Toeffe3]

Current behaviour: Slider snaps at defined key points - but has varying behaviours in different browsers.

Chrome: Snaps, but does only change colour PAST the mark - so dragging the slider to eg. Yellow it will still be orange, but by dragging a little further (not to the next snap-point) it changes, looks excellent:

Firefox works as intended, but cannot handle marks or datalist, so visual is not ideal:

Would be nice to have a combination of both, but behavior is not at all standardized.

[Andreasgdp]

We need to have a talk about this one. I thought we had agreed on having a theme selection window with preview items sort of like this example:

[Toeffe3]

API handles for theme should be made before any other changes can be implemented and tested