Improve motor load/stall indication

[roryaronson]

From Marc: "The software communication back to the user regarding motor stalls need to be improved in a way that makes it easy for new users to clearly understand that a motor stall has occurred."

When a stall occurs:

• [ ] Change axis current position field and jog arrow button background to #ed6666.
• [ ] Change the main navbar current coordinates color of the stalled axis to #ed6666.
• [ ] Override axis state text to "stalled", with color #ed6666, when a stall has occurred for an axis.
• [ ] Revert above styles/text upon initiation of new movement (non-idle axis state).
• [ ] Change "Relative movement failed" toast for stalls to "Stall detected on Y axis"?

The following improvements are subject to change depending on the new 3D farm designer environment. Best not to start them until 3D designer is in production.

• [ ] Change nominal trail color to blue.
• [ ] Add stroke-linecap: round; to all trail segment styles.
• [ ] When a trail segment has missed steps, change trail color from blue (0) -> yellow (1-3) -> orange (4-6) -> red (7+).
• [ ] When user mouses over trail segments, increase stroke-width to 5 and change cursor to pointer.
• [ ] Add tooltip popup for when user clicks trail segments to indicate motor load for that segment.
• [ ] Remove current FARMBOT MOTOR LOAD layer/toggle, as the above changes replace that functionality.

• [ ] Add motor load heat map indicators on edges of map.

[wullumpie]

It can be helpfull if the heat-indicator for the x-axis could be shown for both x-axis motors. The same with other stall-related info.