GitLab

Added md5 check between edit and done on friends + fix all leaks related to friends or friendslists found by tester

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

Updated Android Makefile for belr and belcard + renamed friend variables to lf because friend is a keyword

Prevent sending multiple identical subscribes for presence list + send new subscribe when adding a friend.

Handle versioning of presence list notifications + store information that we have received presence information for a friend.