Revert "Revert "Update Delegate.""

This reverts commit 866abe381a66aab4ce203743e6dd1aa7afe7d250.
Update PyQT program and Arduino program. Add LED, config ctrl.
Update PyQT program and Arduino program. Add LED, config ctrl.
Merge branch 'master' of https://github.com/Unique-Workspace/Fast_Planting_System
Add params config_process.
Update PyQT config setup.
Move to Raspi directory, delete PC_control.
Add broadcast scanning && display table refresh.
Add time&date display.
Update Arduino delay time && improve Raspi program.
Add QWT plot curve display in python program.
Improve plot display, add table_plot_node to be selected for showing its plot.
Update plot display.
Merge branch 'master' of https://github.com/Unique-Workspace/Fast_Planting_System
Update plot display. Waiting for the database interface.