waitpid:  CRITICAL BUGFIX.  Add a reference counting mechansim to prevent wait from using stale memory that was freed by the exiting task

Adds a driver for the PCA9635PW I2C LED driver IC which can be used to control the intensity of up to 16 LEDs.  From Alexander Entinger

Modules:  Add mod_setsymtab to set global symtol table once.  Now we can remove symbol table parameters from the insmod call.  This will make implementing an NSH insmod command much easier

OS modules:  Add basic procfs support.  A module registry that will eventually be used to support lsmod

Move module support from binfmt/ to sched/ so that it can be configured and built independently from binfmt features

binfmt/libmodule:  Add support for kernel modules.  Initial commit is  just the ELF module support with name changes

Refresh all configurations that have Telnetd enabled; those configurations now also need the telnet driver