Release v0.6.3

• Fix a double free in LE file format handling
• Fix arrow keys on some terminals
• Fix #3835: off-by-1 for 32-bit x86 stack args
• Fix dbg.hwbp config variable
• Fix j/k movements in visual hexdump mode
• Fix some leftovers of the ?i command
• Try searching for backtrace() in libexecinfo.
• Implement add r#, K in the x86 assembler
• Improvements in w? help and env command
• regex: support \s
• Refactor some rz_core_cmd*() calls to use the API instead