STYLE: use ""_deg user-literal for degrees to radians conversion

ENH: add degToRad() multiplier (useful for scalar fields)

- use degToRad() functions throughout instead of scattered local solutions

src/meshTools/triSurface/booleanOps/surfaceIntersection/edgeIntersections.C

@@ -41,10 +41,10 @@ License
 namespace Foam
 {
 defineTypeNameAndDebug(edgeIntersections, 0);
-
-scalar edgeIntersections::alignedCos_ = cos(degToRad(89.0));
 }
 
+Foam::scalar Foam::edgeIntersections::alignedCos_ = Foam::cos(89.0_deg);
+
 
 // * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //