It is often useful to get a slice of some maximum len, also accepting
smaller results if the source is not large enough.
This also makes the function always operate on byte indices. Before,
it was inconsistently skipping ansi codes sometimes.
This also fixes potential oob writes in panels.c
Add pac and sig creation with options & compression via commands and via new rz-sign
Add missing arch (arc, pic, riscv, spc700 xtensa, and more)
Side note:
on other tools public functions and references are generated in a sequential
way besides the first one which is the first to be assigned.
since we do not search for sequential references, then we can avoid to
add extra public or referenced functions
Extra:
* Refactoring rz_analysis_mask definition
* Add rz_str_startswith_const and rz_list_iter_get_next_data
