[fix/fp-memory] Reduce FP memory consumption

[felix-schwarz]

Description

• ios-sdk: update to fix/fp-memory branch to reduce memory consumption further
• FileProviderExtension: remove CrashReporter framework to lower memory consumption
• ownCloud File Provider.xcscheme: remove stack logging debug option to lower memory consumption enough to make the extension actually debuggable again

Related Issue

#1362

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

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[jesmrec]

Approved from my side since it fixes one if the existing issues (Content unavailable errors), and might mitigate some of the crashes. But, not a final solution.