Spaces can now join the hackspace foundation#125

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castaway wants to merge 6 commits intomainfrom

castaway/space_membership

Commits on Jul 1, 2019

Add ports and importing space data info into README
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Send space join approval request when user changes/sets a space from a profile edit
castaway
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Create SpaceMembership (mostly duplicated from SupporterMembership)
castaway
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Commits on Jul 2, 2019

Rest of space-membership flow, including gocardless mandates/payments
castaway
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Commits on Jul 4, 2019

Appeasing the style critic gods..
castaway
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Commits on Jul 15, 2022

Space membership: Tidy up some lint/confusing bits from review
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