GUI test changes and fixes

• Moved materia-submodule directly inside gui-folder to get it correctly working as a yarn workspace (yarn workspaces need to be subfolders within the folder containing package.json)
• Fixed few cyclical dependencies in the app to get the tests working: the import sequence of modules is different within testing (and webpack is not used either) which seems to make it much more prone to fail due of cyclical dependencies between ES6 modules.
• Updated the overview page tests to work with the current state of v0.11.0
• Added quantities from the new index to be outputted into searchQuantities.json by the CLI-command.