Master

Pr_fixes

stm32l4_renames

This change should significantly improve the performance of single precision floating point math library functions. The vast majority of changes have to do with preventing the compiler from needlessly promoting floats to doubles, performing the calculation with doubles, only to demote the result to float. These changes only affect the math lib functions that return float.

VFS ioctl() again.  Per comments from David Sidrane, file_ioctl() should not return success if the ioctl method is not supported.  It probably should return ENOTTY in that case.

stm32l4_tickless; avoid Lyme, support timers, pwm, oneshot, freerun, and tickless scheduling