Allow sizes as string and set async true by default

TASK: Simplify fusion code and allow + prefer sizes as string

Sizes can still be passed as an array but this is now a fallback only.

Add widths as argument in addition to sizes

v1.2.0

FEATURE: Allow manual passing of widths in addition to sizes

v1.1.2

BUGFIX: Correct access to asset-width

Bugfix for witdhSrcset calculations

BUGFIX: Add getCurrentWidthMethods to scalable sources again for calc…

…ulations

Integrated DummimageService

The DummyImages are now created internally by imagine wich
relies on the configured imagine-driver of your neos-installation.

Dummyimage endpoint ur is by default: //kaleidoscope/dummyimage
Supported url-parameters are: width, height, backgroundColor, foregroundColor and text

Initial release

v1.0.0

BUGFIX: Apply presets correctly