NSH: Separate command line parsing from command execution.  Add support for multiple, semicolone separated commands on each line

NSH: Code expects CONFIG_NSH_DRIPADDR and CONFIG_NSH_NETMASK even if DHCPC is necessary.  For now, just removed the dependency on DHCPC in the Kconfig file, but more thought is needed.

NxWM::CTouchscreen: Add CONFIG_NXWM_TOUCHSCREEN_DEVINIT to suppress attempts to initialize the touchscreen from NxWM in the kernel build

NxWM: Can now disable the NxConsole window.  STM3240G-EVAL knxwm: Disabled the NxConsole for now because there are issues with the kernel build.

NxWidgets server initialization must be performed in the kernel when NxWdigets is built in kernel mode

apps/examples/i2schar: Raise priority of the receiver thread.  In a loopback test, catching the returned data is higher priority than sending new data

Various fixes from initial attempts to integrate the SAMA5 SSC/I2C driver with the I2C character driver loopback test

NxPlayer play thread stack size is now configurable;  all NxPlayer threads are named via pthread_setname_np().  From Ken Pettit

Correct unitialization of composite USB device.  A stale pointer was being reused.  From David Sidrane

Extend stack debug logic to include IDLE and interrupt stacks.  Also color the heap as well.  Based on suggestions from David Sidrane