Show tooltiops for shader options

[TotallyNotOndre]

fix #690

[Cleptomania]

For some reason I can't capture a screenshot of these tooltips, but the tooltip positioning seems to go from the bottom of the screen. If you turn GUI scale down to like 2 or 3 it's apparent. That problem isn't really a problem with this PR, but it would be nice to fix that at the same time if possible?

[TotallyNotOndre]

should i just draw it at mouse location?

[Cleptomania]

I toyed with it, and changing

final int y = this.height - (panelHeight + 4);

to

int y = mouseY + 10;
if (y + panelheight >= (this.height - 4)) y = this.height - (panelHeight + 4);

This looks much better in my opinion, but I checked modern Iris and it actually still always draws the tooltip at the bottom too. So not sure what we should do there. Personally I like the Y level being based on the mouse position.

[TotallyNotOndre]

looks more readable than if it just follows the cursor

[Cleptomania]

I think we can just merge this as is, it's in line with what Iris is doing in modern, if we wanna change the positioning later we can revisit it

[TotallyNotOndre]

ok then