Several fixes for 'pxa' and visual mode interaction
r_hash_name_to_bits is now case-insensitive
Handle shift-tab to toggle px/pxa in visual

- Support non-colorized pxa output
Fix #226 - Hash names are now insensitives in r_hash_name_to_bits
Fix malformed ELF segfault, re-enable warning
Minor refactor in rax2
Fix fcnsize calculation