Update return value of sdb_foreach callbacks
Fix asm/d clean
Fix #575 - Thanks @montekki - plus other enhacements

- Use ↑ for utf8 backlines
- Support multiple RAnalMetas on every line in disasm.c
- Use sdb in disasm to retrieve RAnalMetas instead of api
RCons.clear_line() now can clear stderr line too
Fixes #150
Strip 'ptr ' from capsone x86 disasm