Do not block in linphone_core_iterate() while the are unregistrations to...

Merged Andrea Gianarda requested to merge fix/readme into master

Do not block in linphone_core_iterate() while the are unregistrations to perform after calling linphone_core_stop_async(). Fix nuget package README.md. Fix memory leak in bctoolbox's logging feature.

bctoolbox!306 (merged) liblinphone!3187 (merged)

https://linphone.atlassian.net/browse/SDK-236

Edited by Andrea Gianarda

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