0.3.0

Summary of new changes:
-added firmware command to retrieve current version
-added button to retrieve the current Swapper3D version and display in octoprint swapper text element
-added octoprint Swapper3D plugin settings:
Stock extruder Max feedrate(M203 mm/s)
Swap extruder Max feedrate(M203 mm/s)
Stock extruder Max acceleration - normal(M201 mm/s2)
Swap extruder Max acceleration - normal(M201 mm/s2)
ms of delay after sending the extrude command to printer
ms of delay per degree moved during pulldowns
this allows much faster iterations on the setup process
-added a 2nd stage to the unload pulldown 'pulldown to locking height'. This makes the locking in of the QuickSwap-Insert much more robust
-improved firmware memory usage
-adjusted octoprint Swapper3D plugin default settings
-automatic updates are enabled. This requires the first update manually to this version, then subsequent version updates will be prompted inside octoprint
-Palette multi cut implemented
-Stop tool reversion so that Swapper3D can be used with the MMU detached and no firmware changes
-added checkbox to autoscroll Swapper3D log text box
-bugs fixed:
-M702 infinite loop, try to reproduce on shorter test print.
-failed insert loading
-doesn't extrude before the first swap
-Button check not working
-check button logic upgraded: now the wires can be connected to any of the button terminals
-nozzle wipe implemented in Octoprint
-nozzle wipe settings added to Octoprint
-added min extrusion since last swap safety check
-added auto-connect to Swapper3D on octoprint plugin startup