Fix some tutorial bits

[aquagoose]

Summary of the PR

• Fixes the Texture tutorial so it uses glTexParameter instead of glTextureParameter
• Replaces uses of StbImageSharp with ImageSharp
  • This was done because all the other tutorials use ImageSharp, and at the time when I wrote the texture tutorial I decided to replace ImageSharp with StbImageSharp for some reason, but only in the texture tutorial and the existing abstraction tutorial which makes no sense. Also there was a lot of pushback after it was merged after the team noticed it had been replaced, so I'm righting the wrong here.

Related issues, Discord discussions, or proposals

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Further Comments

[Exanite]

Looks good to me. We can merge once we get a review from Beyley.

I ran the examples locally on Linux and they work fine.
Behavior also matches the main branch.

[Perksey]

I'm happy to bless this on behalf of Beyley

[Exanite]

@Perksey Feel free to merge. I don't want to merge this myself since I added an extra commit above.