Improve use of whitespace on charts, make elements bolder, add "streaming mode" toggle for overlaying charts using Chroma key in OBS

[strazto]

Resolves #88
Resolves #89

Squash Requested I'm not a C# programmer & have minimal experience with .NET and WPF, so many of my commits are fixups / trying to understand idioms & also match the patterns already seen in the project.

This PR addresses graph styling in two areas

1. Improves whitespace usage & increases font size of certain chart labels / titles
2. Adding a "Streaming Mode" toggle that sets:
   • chart FG colours to white (255, 255, 255), and
   • BG colours to green (0, 192, 0)
     The purpose of this is to allow effective chroma-keying of the green background for the live charts out, using streaming/recording software (Eg, OBS), for the purpose of either streaming/recording instructional videos, or watching back recorded real gameplay to understand what parts of your curve are being used in real-game situations.

Find screenshots below - I'd share a Kovaaks recording but I don't want to embarass myself.

Chart Style Improvements

Before

After

Streaming Mode

RawAccel with "Streaming Mode" Enabled

OBS Output After Chroma-Key

OBS Chroma Key Settings

[JacobPalecki]

Hey, these changes look great. I'm going to do a more in-depth review later but nothing stands out as wrong at a glance.

[strazto]

@JacobPalecki - I haven't tested this out yet, but it's possible that Chroma-keying might work effectively if the key is set to be dark/black in OBS.

I'll have to confirm that's true, but if that's the case, I might ask that we delay merging this & I will change "Streaming Mode" to "Dark Mode" & expand the colour changes to theme the whole window dark.

[JacobPalecki]

@JacobPalecki - I haven't tested this out yet, but it's possible that Chroma-keying might work effectively if the key is set to be dark/black in OBS.

I'll have to confirm that's true, but if that's the case, I might ask that we delay merging this & I will change "Streaming Mode" to "Dark Mode" & expand the colour changes to theme the whole window dark.

That's fine. I've reviewed the code changes and they are good. I've never set up a streaming overlay myself so I'm not exactly sure about any subtleties around the chroma-key but am happy for a background color change to bring some utility there. A dark mode would be useful to users regardless of chroma-key so if you wanted to add a dark mode and streaming mode that would be cool as well. Totally up to you

[strazto]

Actually, I won't have time to have a look at this properly for a bit - go aheard & squash merge it, and later on I can either add dark mode, or change it to dark mode :)

Thanks for the review - Nice to get a review w/ no change requests :)