UI updates and app reorganization#3

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lukasrichters14 wants to merge 8 commits intodevfrom

Commits on Dec 27, 2019

Added notification service using Firebase. App should now display notifications when it is in the foreground.
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Merge branch 'dev' of github.com:SpartaHack/SpartaHack-Android into dev-lukas
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Commits on Dec 30, 2019

QR scanner is ready to test.
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Commits on Feb 2, 2020

Commits on Feb 3, 2020

Changes to UI.
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Commits on Mar 8, 2020

Reorganized the app to use fragments instead of activities. The UI now uses bottom navigation to switch between pages.
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