ProjectsRoot displays more stuff

[local-minimum]

• Lists projects in the order it gets them
• New Project button and its form/panel.

[codecov-io]

Codecov Report

Merging #350 into master will increase coverage by 0.19%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #350      +/-   ##
==========================================
+ Coverage   49.48%   49.68%   +0.19%     
==========================================
  Files         225      229       +4     
  Lines       19731    19806      +75     
  Branches     2890     2891       +1     
==========================================
+ Hits         9764     9840      +76     
+ Misses       9563     9542      -21     
- Partials      404      424      +20

Impacted Files	Coverage Δ
.../ui_server_data/js/src/components/ProjectPanel.jsx	100% <100%> (ø)
.../ui_server_data/js/src/components/ProjectsRoot.jsx	100% <100%> (ø)
scanomatic/ui_server_data/js/src/prop-types.js	100% <100%> (ø)	:arrow_up:
...erver_data/js/src/components/ProjectsRoot.spec.jsx	100% <100%> (ø)
...erver_data/js/src/components/ProjectPanel.spec.jsx	100% <100%> (ø)
scanomatic/ui_server/general.py	22.41% <0%> (ø)	:arrow_up:
scanomatic/ui_server/data_api.py	9.65% <0%> (ø)	:arrow_up:
scanomatic/data_processing/phases/features.py	17.23% <0%> (ø)	:arrow_up:
scanomatic/io/source.py	18.08% <0%> (ø)	:arrow_up:
scanomatic/data_processing/phenotyper.py	27.51% <0%> (ø)	:arrow_up:
... and 7 more

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[gdetrez]

Also, there are new warnings in the tests run.

[local-minimum]

That should fix both issues.