add Peer Class (conenction send & receive)
Reformat files
Change XML format

+ add pointers for devices (same devices for multiple folders)

Fix some memory leaks (using assignment operator overloading and destructors). Some memory leaks have to be fixed.
Fix memory leak (using pointers)
PeerConfig contains pointer to devices and folder too (same address for the same device in different folders)
Serializer: Using vectors instead of arrays