`maths.dm`:
Removed `var/const`s `E`, `Pi`, `Sqrt2`.
`setup.dm`:
Re-added `PI` here, and added `Sqrt2`, `E` as macros.
The reason for this is that macros have a performance improvement over `var/const`s.
`lists.dm`
Changed the formatting of the `BITTEST(...)` etc. macros so that they can be found by
searching for `#define BITTEST`
`rig.dm`:
Fixed unknown variable error resulting from the usage if `STOPSPRESSUREDMAGE`
which was renamed to `STOPPRESSUREDAMAGE` in one of my earlier commits.
Others:
Replaced constant variable `Pi` usage, with macro `PI`.
203a7f1092