Misc changes to get a clean build after all of the syslog changes.  There are probably other things still broken

Remove non-functional vestiges of OTGHS in FS mode (including OTGFS2); try to convert the stm32f429i-disco configuration to use OTGHS instead of OTFHS in FS mode (OTGFS2).  But I don't have the boards and can't test

Integrates OTGHS support into the STM32; Eliminates the older OTGHS in FS mode logic.  From Brennan Ashton

Add files that implement true high speed support for the STM32 OTGHS peripheral.  From Brennan Ashton

Simulation: Change how simulated UART data availability is signaled.  The last change is not safe (but I don't like this workaround either -- maybe something better will come to me).

simulation: Add a simulatied UART input device.  Also lots of misc clean-up for stylistic compatibility with other architectures

More vfork():  If we get to vfork() via system call, then we need to clone some system call information so that the return form the cloned system call works correctly