Add inline to a few places

[hecatia-elegua]

where else would it make sense?

[danlehmann]

Did you ever see any difference with these? Not against it, just curious

[hecatia-elegua]

Since I'm using the From impls, it didn't inline those calls across the crate boundary into the code generated by bilge.
This solved it. The other impls are just a line of code, so I added it there as well, I just left out the math ops :)