Fix #1820 - Avoid SIGPIPE in r_sys_cmd_str_full
Enforce weak/unowned linked lists by code, needs more testing
Enforce 64k method limit for DEX
Fix crash when passing NULL to RBufRead
Fix more crashes on DEX
Fix another crash in DEX
Fix another DEX/uleb related crash
Fix another DEX uleb crash
Another overflow in DEX
CL without arguments is an alias for 'CL $$'
A fix for a MACH0 crash
Fix infinite loop in DWARF parser spotted by Melkor
Implement `dko` for Linux. Enhace the command and support SKIP and CONT options

- Can continue into the signal handler
- Can skip the instruction and ignore the signal handler
- By default it will just stop in there
Enable backtrace(3) in NetBSD >=7.0

This patch was prepared with the assistance of the upstream.
Update sdb from git, fixing some crashes
Fix PE parser issue
Fix #1799 - Detect main symbol in Linux ELF PIE bins
Update capstone and fix some ARM64 analysis issues (still buggy)
Implement r_file_dirname and support DOS paths in r_file_basename too
add init function of pdb downloader