Feat: Provide SVG sprites loader

[factorial-io]

Feat: Provide SVG sprites loader

[krisimmig]

A working version is now in this feature, anybody wants to do some testing?

16-svg-sprite-loader/packages/svg-sprite

Some open questions:

• is removing the fill and stroke colors from all svgs a good idea?
  I think it it is much easier that way to style them with css, but more complex SVGs will loose the coloring all together.
• is this also working in IE11 and Edge?
  Haven't tested this, yet.
• something else missing?

[mlnmln]

@krisimmig I'll have a look today – sorry for the late feedback.

[mlnmln]

I can't get this running in the example folder after 30m trying out.
Could you provide a PR with changes in the example folder that get this running? Thanks.

Some concerns:

• How would this work in a twig template / PHP environment? How does the spritemap get injected in that case?
• Does this conflict with our existing file loader? We import svg fonts in CSS in our usage example?
• For IE11 compatbility we usually need this polyfill here https://github.com/jonathantneal/svg4everybody is that included?

[krisimmig]

• the spritemap is injected by the sprite-loader itself
• there is a conflict when loading svg files from css at the moment which causes an error in the build
• IE11 is working without the ployfill

I will try to fix the svg import from css files..

[mlnmln]

Sounds good to me. I pushed some changes a couple of days back. Make sure to pulle them.