Added motor and current saturation to the led status bar

[acheronfail]

Following up on this suggestion here: #44 (comment)

A couple things to align on before this is ready to merge:

• right now DUTY = orange, MOTOR I = magenta, BATTERY I = green - let me know what you'd prefer
• currently when the battery is low the last LED pulses every second - do we want this faster/slower?
• should I split out the battery blinking into a separate commit + feature: / leave it as is / update the current commit message + trailer? done in On low battery pulse a single red led #84
• I renamed status_duty_blend -> status_blend, and also duty_threshold -> status_threshold, hope that's alright renamed to status.motor_utilization_threshold

[lukash]

Thanks for this.

I was actually just recently thinking I should get to add the last led blinking when battery empty. Yes please definitely do that as a separate commit, it's independent from the motor utilization change. Could even go into a separate PR.

I'll have to find some time to do a full review, how determined are you to get this into 1.3? Should be possible... At first glance the code looks reasonable...

[acheronfail]

I'll have to find some time to do a full review, how determined are you to get this into 1.3? Should be possible... At first glance the code looks reasonable...

I'm not fussed, if I want these features I can just put them on my board myself.

I was actually just recently thinking I should get to add the last led blinking when battery empty. Yes please definitely do that as a separate commit, it's independent from the motor utilization change. Could even go into a separate PR.

Sounds good, I'll remove from this PR and create a new one.

[lukash]

Rather than commenting I ended up doing a bunch of fixes myself. Wanted to push it to the PR branch but for some reason it doesn't work so I pushed it here: https://github.com/lukash/refloat/tree/acheronfail/status-current-colours

In short, fixed a bug with negative battery current (previously it was dividing two negative numbers resulting in a positive ratio, you've added a fabsf so I added another one for consistency with the motor current and more transparency), adjusted the two new colors, cleaned a bunch of stuff on the new option and added migration from the old option to the new, since the rename would cause all users to lose this setting. It'll only work for tunes within the UI, not XML backups, but preferable to keep the option name true to what it does. It's all in fixups meant to be squashed with the original commit.

Also rebased to resolve a conflict and I adjusted the Feature: trailer text too. Please check my changes, hopefully I didn't mess anything up. I'd also like to ask if you could test the config option migration is working. You have to go from version 1.2 for it to work though. Meaning:

1. Load 1.2
2. Set the Status Duty Threshold to a non-default value
3. Load 1.3 with these commits and see if your custom value carried over

Planning on releasing 1.3 preview 3 tomorrow morning before I leave for a weekend event, would be cool to get it in, but if you don't make it no big deal, I'll merge it later. Thanks!