[OS] LIBC - Add memcpy() function to replace huge implementation from libc.
[OS] printf - Added a lightweight printf() routine from FreeBSD.
[OS] printf/printk - Added a bt_putc function with API for setting/getting standard handle.
[OS] BT_kPrint (printk) - Added a simple implementation of the printk api.

Eventually this will be configurable to simply output to the boot-logger device,
or later push the messages into the real syslog system.
[VERSION] Bump to 0.5.0-pre (Heisenberg's Cat).
[OS] BT_MAIN - Updated to use the new BT_kPrint() API.
[BSP] ZED_BOARD - Updated test program to test printf functionality.
[OS] TIMER API - Fixed the timer api.