tmgr: add help lines in kcnf

Signed-off-by: Nikita 'webconn' Maslov <wkernelteam@gmail.com>
Full rework of timers library

Now structure is a bit closer to Linux kernel timers.

See docs for further information.

Signed-off-by: Nikita 'webconn' Maslov <wkernelteam@gmail.com>