Entity viewer sidebar toolstrip (#238)

* move track panel bar icons to sidebar folder

* replace TrackPanelBarIcon with ImageButton in TrackPanelBar

* add styling to sidebar icons and fix sidebar class names

* Add sidebar toolstrip to entity viewer

* change the following to lower case: toolStrip, sideBar, topBar

* use lowercase for topBar in all other places in the site

* fix storybook issues

* fix wrong sidebar class names

* get rid of sidebar configs

* Replace shortened EV with EntityViewer

* PR suggestions
6 jobs for dev in 4 minutes and 29 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test Build Static
passed #150611
Test_N_Build

00:03:04

passed #150612
Test_N_Build:internal

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  Build Docker Images
passed #150613
Nginx

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passed #150614
Nginx:internal

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  Deploy
passed #150616
Deploy:internal

00:00:15

passed #150615
Staging

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