Refactor extensions interface (#344)

* Added container class for plugins that care for registration of submodules

* Added extensions manager that cares for adding modules to store

* Make extensions require less knowledge of internal extension management

* Reformatting

* Update generateStaticSite to use ohif-viewer, remove old OHIFViewer-react folder

* Add yarn.lock so Netlify knows to use Yarn

* Fix for copying static site folder

* Try to fix netlify build which is stuck uploading

* Try to fix static site deployment

* Try to fix static site deployment again

* Try to fix static site deployment one more time

* Extracted pdf plugin into external package

* Removed some unused dependencies

* Published pdf extension to npm registry

* Added external microscopy extension (work in progress)

* Extraction of microscopy plugin working now

* Added microscopy extension npm package to package.json

* Increase ohif-core version

* update yarn.lock

* Fix error in readme

* Fix authentication error in pdf plugin

* Remove readme, update packages, add redirect for netlify

* netlify test

* netlify test 2

* netlify test 2, forgot to add new redirects file

* Use public dicom server for demo

* Another netlify try

* Another netlify try 2

* Another netlify try 3

* Another netlify try 4

Packages-react/extensions/OHIFDicomPDFExtension/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2018 Open Health Imaging Foundation
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.