* add templates for common geometric constants
* oops missed one
* LD_2PI -> LD_PI
i re-added the wrong constant ffs
* CamelCase names and also verify compilation without -DLMMS_MINIMAL
* C++20 stuff
Updated to account for `<numbers>` and C++20:
- Marked all `lmms_constants.h` constants with an exact equivalent in `<numbers>` as deprecated
- Removed all `lmms_constants.h` constants where no variant is currently in use
- Using `inline constexpr`
- Using `std::floating_point` concept instead of `typename`
* add lmms::numbers namespace
* Remove panning_constants.h
Moves the four constants in panning_constants.h into panning.h, then
removes panning.h.
* Use std::exp(n) instead of powf(numbers::e, n)
* Use C++ std math functions
Co-authored-by: Dalton Messmer <messmer.dalton@gmail.com>
* Use overloaded std math functions
An attempt to fix compiler warnings on some platforms
* Remove uses of __USE_XOPEN
And also update two functions I missed from the previous commit
* Missed a few
* Fix ANOTHER std math function use
Of course there's another one
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Co-authored-by: Dalton Messmer <messmer.dalton@gmail.com>
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