Create Connections Data Structure for Video Server

[dragonprevost]

When serving frames from the OBC picamera, we may have multiple clients that are trying to acquire these frames. In order to accomodate this the VideoServer application has to have a data structure that holds the information for each client so it it can iterate through each client when sending frames

Psuedo Code

# New Connections
data, address = sock.recvfrom(4)
data = data.decode('utf-8')
    if(data == "get"):
        connections.append(address)

# Sending Frames
for client in connections:
    sock.sendto(frame_buffer, client)

Notes:

• This issue 'sort of' depends on #24, communicate with whoever is working on that issue before starting
• Everytime a new client connects you must add this client to the datastructure
• Frames should be pushed to every client in the structure.
• If a client is not connected anymore it should be removed from the structure

[noahwc]

I've begun work on this in the connections branch. The basic data structure is there. Next task is to listen for incoming heartbeats from clients.