flashforge_util

Minor cleanups, added message confirming printer connection with model, IP address, etc.

Added commands to acquire and release control of the printer as the tool is launched and terminated. Added termination handler to ensure the release commmand is issued prior to terminating the tool (otherwise FlashPrint refuses to connect, saying the printer is "busy")

Added a live print progress view that shows filename, progress indicator, estimated time remaining, temperatures, etc

Changed tool to use a single socket for all requests during a single run. As far as I can tell from observing traffic between FlashPrint and my printer, that's how it's generally done. This seems to improve the reliability of file uploads to the printer, though it is still not 100%...