Makes the following changes to the Lb302 plugin for increased functionality, maintainability, and readability:
- Add note velocity & note panning to Lb302
- Remove evil mutex+dynamic array combo in favor of a real-time safe ringbuffer queue
- Use non-static data member initializers where possible
- Use `std::numbers::pi` instead of `M_PI`
- Use `std::array` and `std::unique_ptr` instead of manual memory management
- Change plain-old-data classes with only public members to structs
- Change some ints to f_cnt_t to better communicate their purpose and avoid weird implicit casting nonsense
- Change floats to sample_t where appropriate to better communicate their purpose
- Find suitable homes for loose constants
- Prefix standard library math function calls with std::
- Ensure all floating-point literals intended to be floats end in 'f' and are not doubles to appease MSVC
- Change uses of SIGNAL and SLOT macros to whatever they should be post-Qt6 upgrade
- Tidy code to conform to current code conventions
Also adds Hardware.h for low-level performance tools:
- busyWaitHint(), supporting x86, ARM, and RISC-V
- hardware_destructive_interference_size polyfill, supporting x86, ARM, RISC-V, and PPC
- Moved the contents of denormals.h to Hardware.h, renamed disable_denormals() to disableDenormals()
- Added ARM support to disableDenormals()
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