Many fixes to handling continuous/multiple socket connections.

[MatthewMenze]

…FOR FULL FUNCTIONALITY. DEVICE CURRENTLY SHIPS WITH OBSOLETE FIRMWARE.

• Added 2056 byte read and backlog buffers (can probably be made smaller)
• Added a 1000uS window on read operations from module (can probably be made smaller)
• Increased memory allocation to response/command variables in various functions to avoid out of bound memory writes.
• Added bufferedPoll(), this replaces poll() functionality, but iterates over buffer and handles each event
• Added some error handling to socketOpen()
• Added some error handling to socketCloser()
• Added error handling to socketWrite(), to not write in case of error.
• Added delay before responding in socketWrite(), according to ublox specification
• Added socketWriteUDP() function, to properly write UDP packets according to ublox spec.
• Added error catching to socketRead()
• Added socketGetLastError() function that requests last socket error from module, for debugging
• Added expectedError parameter to waitForResponse() to allow function to exit without error without running entire timeout if it can
• Added backlog buffering to waitForResponse()
• Added backlog pruning to waitForResponse()
• Improved error codes returned from waitForResponse()
• Added backlog buffering and pruning to sendCommandWithResponse()
• Added backlog buffering to sendCommand
• Removed code that dumped read data in send command
• Created function pruneBacklog() that parses backlog and prunes non-actionable events, reducing future processing time in poll, and reducing buffer size needs.
• Added value to error enumeration to signify when module has returned an error from a command.