Rename CONFIG_EXAMPLES_NXCONSOLE to CONFIG_EXAMPLES_NXTERM; rename CONFIG_NXWM_NXCONSOLE to CONFIG_NXWM_NXTERM

examples/null/null_main.c:  Need to include config.h it order know if this is or is not a kernel build

Several commands must be disabled in the kernel build because they depend on interfaces that are not available outside of the kernel: dd, df, losetup, mkfatfs, mkdr, and ps.