Fix issue #849; Respect the OctoPrint axis invert flags

[pfemiani]

I went ahead and took a stab at fixing the issue where the OctoPrint axis inversion setting was not being respected in the in the printer control view.

• Created PrinterProfileService
• Implemented getDefaultPrinterProfile()
• When Control view loads it gets the default printer profile, and subsequent axis moves take the "inverted" setting into account

Fixes #849.

[UnchartedBull]

Great contribution. Thank You! Just two minor things, but otherwise this is ready to be merged :)

[UnchartedBull]

Thank you. Will be released with the next version :)

[pfemiani]

@UnchartedBull ... I have no idea how I missed this while testing, probably because I was mostly looking at inputs/outputs, and visually testing primarily with Z axis... but the Y axis controls in OctoDash seem to actually be sending the wrong direction. If you click the up arrow, it is configured for a "-" direction, and down arrow configured for "+". However, in OctoPrint if you click the up arrow it moves Y in positive direction (assuming axis inversion is not enabled). I debugged/stepped through and verified X and Z axis both move in correct direction, and all 3 axis correctly respect the inversion setting, just the Y axis controls are backward. Let me know if you would like me to create an issue or another PR to fix this, or if its easier for you to just knock it out since it should simply be switching the "-" and "+" for the Y axis in control.component.html.

Thanks in advance! I'm really loving OctoDash!

[UnchartedBull]

I'll have a look at it once I'm back :)