More control over radare2 spawn options

[valbucci]

New Extract Options

Added more control of the radare2 spawn options.

Now bin2ml extract supports the following additional options:

• --experimental-analysis: analyse binary with aaaa
• --apply-relocations: use -e bin.relocs.apply=true instead of -e bin.cache=true (slower but more accurate)
• --disable-pseudo-asm: set -e asm.pseudo=false. Previously was always set to true, now it's kept as the default value.

Minor Changes

• Improved logging and added few more comments.
• Convert timeout value to milliseconds as that is what radare2 uses.