Better peer-dependencies

[ger-benjamin]

Change:

1. Ol moved to as peerDependencies.
2. I don't see any usage of color-rgba, color-space. They were added to fix sub version, but everything looks working without them. I think we can get ride of them.

Open questions:

1. We import all d3, we could be more selective. => Tried and was complicated, let see that in another PR
2. And do we want flexibility on more library ? Candidate:
   1. file-saver
   2. lit*
   3. moment
   4. ol mapbox
   5. ol layerswitcher only used for css !)
   6. qruri
   7. rxjs
   8. tinycolor
   9. Others ?

=> Can be moved to peerDepedencies on demand later.

See JIRA issue: GSNGEO-19.
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