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    upnp: support libupnp and libnatnatpmp simultaneously · 60515d89
    Eden Abitbol authored
    Update libupnp to version 1.8.4.
    
    For windows, the IPV6 preprocessor must be undefined. Or else
    libupnp won't initialize. Added visual studio 2017 support
    via one patch for windows that also combines previous windows
    patches.
    
    UPnPController: Class that the jami classes use to control the
    opening and closing of ports. Every  service has it's own upnp
    controller. The controller does it's actions by using the upnp
    context class. Also refactored the functions used to add
    mappings. Instead of using two different functions with
    different types of parameters, we now use one function with
    parameters that have default values. The logic stays the same
    but the function call is more clear.
    
    UPnPContext: Class that holds a (linked) list of discovered IGDs
    and their corresponding protocols (which discovered them).
    Whenever the controller wants to add or remove a mapping, the
    context picks a valid IGD in it's list and uses the correct
    protocol to complete the required action. This class also has
    the ability to swap protocols for an IGD that was discovered
    by more then one protocol.
    
    UPnPProtocol: Virtual base class that defines the functions
    needed by the context to use the corresponding protocol.
    
    PUPnP: UPnPProtocol derived class that represents a upnp client
    that uses the portable upnp library (libupnp). Every time the
    client discovers a new IGD it uses a callback to add it to the
    context's main IGD linked list. It also has an internal list of
    IGDs that it discovered. Added features to this class include:
    	- IGD event subscription.
    	- Use UpnpInit2 function instead of deprecated UpnpInit
    	  function. It's also supposed to support IPv6.
    
    NatPmp: UPnPProtocol derived class that represents a upnp client
    that uses the NAT-PMP library (libnatpmp). Unlike libupnp,
    libnatpmp only supports discovering one IGD. Also uses callbacks
    to add the IGD it finds to the context's main IGD class.
    
    Also inclided debug warning prints whenever a controller opens
    and closes the ports. That way we can keep track of whenever
    the application opens and closes ports on the internet
    gateway device.
    
    Gitlab: #96
    
    Change-Id: I199271edac2c6d93dc60c24e2e2aefe36de7950c
    60515d89