Add experimental webserver and flutter web build

[sw22m]

• Separate webserver plugin named webserver_experimental.py
• Update API to control and get x,y,z position
• Serves video feed via socket connection
• Initial Flutter frontend to display video feed and create snapshots
• Flutter web build added and served on port 8080 via / or /index.html
• Requires Flask-SocketIO dependency

Thanks, please let me know if any changes required

[JohnDMcMaster]

Thanks for the patch! Some notes per previous conversation with you and/or Yusuf:

• As implemented this will have low frame rate as snapshots are inherently high latency (image processing, request based, etc). Long term we should setup a new gstreamer pipeline with a RTSP, etc stream and directly send that to the client
• Split the simple and the full web server as separate scripts for now. We should keep an eye on this and share code as possible / appropriate
• We'll keep in this repo, although we considered splitting out to another repo. Will be easier to keep in sync here and ease packaging. However, some concerns about how as this app grows it could easily outgrow this repo
• Related to above, we are adding an increasing number of binary assets (fonts, etc). We need to 1) Keep an eye on file sizes as git repo will balloon over time 2) Keep an eye on copyrights / ensure proper attribution
• General questions about the relationship / roadmap between PyQT and web GUI. For now lets experiment and not worry too much

[sw22m]

Thanks John! Will keep these points in mind.