Implement a setting to average left/right face expressions

[Erimelowo]

Adds a section under Stabilize Eyes that adds a setting to average left and right expressions according to certain percentages. This can increase stability at the cost of fidelity.

I struggled a bit with making it affect the preview and decided it wasn't worth it since it might make further calibration harder. I could try my hand at it again if that preview should match the tracking.

Closes #193

[CLAassistant]

All committers have signed the CLA.

[dfgHiatus]

Hey Erimelowo, thanks for your PR. I am having a look over it now - to be clear, the way this setting works is it biases an expression towards a left or right, given some factor above? IE 0.5 is no bias, 0 is left and right is 1

[dfgHiatus]

Separately, for consistency please match the style of the Share eye/face data block.

For expanders with an enabled/disabled checkbox or toggle, we place this on the rightmost side:

(I should note we do not have a template for this at present moment. Feel free to copy over the AXAML in code or make a template for this)

[Erimelowo]

Hey Erimelowo, thanks for your PR. I am having a look over it now - to be clear, the way this setting works is it biases an expression towards a left or right, given some factor above? IE 0.5 is no bias, 0 is left and right is 1

0 is vanilla behaviour, 0.5 is so each side interpolates 50% towards the average of both sides and 100% makes it so both sides are equal to the average of both sides.

Example, if left is 0.2 and right is 0.6, that means the average is 0.4 and that
at 0.0, left is 0.2 and right is 0.6
at 0.5, left is 0.3 and right is 0.5
at 1.0, left is 0.4 and right is 0.4

[Erimelowo]

Matched the style of the Share eye/face data block for the toggle.

[SummerSigh]

im still unsure about this change as it significantly changes behavior of the output. we need to do more testing to verify that this is an improvement with our larger userbase

[Erimelowo]

It is disabled by default…

so far my tracking has been great (much better than before) with this feature.

[dfgHiatus]

Hey there, I've made it home and checked out this PR. Following up on what Summer said I have some usability concerns - while this is opt in, I worry it may not be immediately apparent to end users what and how this feature works.

[dfgHiatus]

I don't want to egg things on. I'm going to close this PR until we have a better means of conveying to end users how this feature is used.

[artifishvr]

Hi! As an end user who has a similar issue this PR would solve, I'd love to see this reopened! It seems clear to me what it does, comparable to existing settings like the "One-Euro filter settings".

If testing is what's blocking this from moving forward, I'd be happy to run it for a bit on my end and report back c:

[dfgHiatus]

Hello, I can take a look at this again. Additionally, I can probably rename the one euro filter setting to something more friendly