Circuit Antoine Schmit 1.0.4

• Fixed weird errant floating grass strip by the first house.
• Fixed weird bumpy grass at the hairpin
• This one really is the last one.
• Probably.
• I hope.
• (please)

I was a little overzealous with the optimizations and it was causing some shadow and tree pop-in. I have fixed that and performance should be the same but it the pop-in should be gone. Also updated the sections file thanks to @Fanapryde and also made the runoff area for the chicane invalid track so you can't cheat anymore.

I got reports that the performance was still not what it should be, so I made some changes that should have minimal visual impact but should improve the frame rate some more.

Made a quick change to hopefully improve performance on lower spec machines a bit.