Help module corrected to use latest extopts version.

Now instead of manual composing help from extmod_print_desc() and
extmod_print_opts() it simply uses extmod_print_desc() which in turn
will also print options at place where "[[OPTIONS]]" occures in module
description.
Added file IDEAS
Introduced pack of integer types for use in tobin.
Implemented integer types printing.
Update embox for using new extopts function extmod_extract().

The correct behaviour of typical extopts-program using this call is:
1. execute module from executable name (may be link to executable);
2. if there is no suck module - try to execute module named as first
argument in command line;
3. (RECOMMENDATION) if there is no such module either or command line
is empty check executable name for correctness. It would be strange if
executable renamed into name of nonexisting module will behave as
usual.
4. execute starndard utility without modules loaded (in this case
command line may be parsed with extopts).