Merge pull request #8 from timgates42/bugfix_typo_evaluation

docs: fix simple typo, evauation -> evaluation

Modernise CMake usage

Only use libstdc++'s constexpr maths functions with GCC

Regenerate sample output

Simplify get_intersections()

Remove workaround for capturing constexpr lambdas

Fix incorrect implementation of pow()

Don't try to use std::pow() with GCC

Add licence information

Update README.md

Initial commit