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* Bad declaration of native implementations
* Memory leak in getParticipants()
* Bad constructor signature

account creator: detect invalid domain by changing linphone_address_set_* methods to return -1 in case of error

add release methods for friends and friend list, so that the core can properly shutdown without leaving references.

This reverts commit f151d70d.

The changes done in this commit break all features using LinphoneContent objects.