Extends <ProjectsRootContainer/> to allow adding experiments

[gdetrez]

This connects all the new components to the state:

• sets the newExperiment* props in the appropriate components
• render <ExperimentPanel/>s for each projects' experiment.
• add system tests that create new experiments

Refactor <ProjectPanel/>: instead of rendering the (new) experiment in the <ProjectPanel/> componenet, they are passed as children. This makes the component much simpler and avoid passing a gazillion props through.

[codecov-io]

Codecov Report

Merging #372 into master will increase coverage by 0.03%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #372      +/-   ##
==========================================
+ Coverage   40.29%   40.32%   +0.03%     
==========================================
  Files         195      196       +1     
  Lines       16729    16735       +6     
  Branches     2917     2918       +1     
==========================================
+ Hits         6741     6749       +8     
  Misses       9573     9573              
+ Partials      415      413       -2

Impacted Files	Coverage Δ
...omatic/ui_server_data/js/src/projects/selectors.js	95.55% <ø> (ø)	:arrow_up:
.../ui_server_data/js/src/components/ProjectPanel.jsx	100% <100%> (+33.33%)	:arrow_up:
...data/js/src/projects/reducers/entities/scanners.js	100% <100%> (ø)
.../ui_server_data/js/src/components/ProjectsRoot.jsx	100% <100%> (ø)	:arrow_up:
scanomatic/data_processing/phases/segmentation.py	73.81% <0%> (ø)	:arrow_up:

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