Converted to Firebase as the backend which substantially simplifies t…#1

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ventisep wants to merge 4 commits intomasterfrom

FirebaseVersion1

Commits on Apr 28, 2019

Converted to Firebase as the backend which substantially simplifies the backend processing. Now some tidying up to do with key values and data design of the timestamps
ventisep
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Commits on May 6, 2019

Started a branch to add times for crews.
ventisep
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Commits on Jun 16, 2019

Added Cashing and access to Firebase Storage
ventisep
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Commits on Aug 6, 2019

Corrected bugs
ventisep
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