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Handle the callbacks associated with a chat message directly in the LinphoneChatMessage object instead of in the LinphoneCore object.

Update tester to preset the dynamic resource path before setting up the linphone core. This prevents error messages while testing on iOS

A normal LinphoneContent object will now copy the data from the given buffer when calling linphone_content_set_buffer().
However LinphoneContent objects converted from LinphoneContentPrivate structures do not own its data fields.