Add support for UTF-8 and better WChar strings in RBin

- Better string recognition.
- Better wchar string detection
- UTF-8 helpers. Better string detection.
- Break on invalid sequences
- Fix the vaddr translation. Misc fixes
Colorize cmd info
Changed switch/case orders - added syscall and break
Fix CID 1224289
Workaround blkdevice size on XNU
Fix build on w32
Fix code analysis on debugger (r_core_io_reat_at issue)
Fix RBin flag strings issue and name filtering
Fix #557 - Handle nested structs and more basic C types in 't'
Don't require the base address to be aligned, fixes #1053
Fix #791 - https://github.com/radare/radare2/issues/791
Set num->value '?v' depending on 'db' success
Fix 'tf'
Remove noisy printf
Add dbg.status to display drd and pi on prompt
Reread block after undo seek. Fixes dbg.status issue
Build capstone with -g
Fix column alignment in visual mode registers (dr=)

Just adds one space of padding for oeax in 32 bit archs.

Fixes #1074
Update capstone fixing segfault in arm32 disasm
Update AUTHORS