Refactor code that uses String#scan to use StringScanner to improve performance

[postmodern]

StringScanner using a while or until loop is rough 2x faster than String#scan with a block. We should refactor the remaining code that still uses String#scan to use StringScanner.

• lib/ronin/support/binary/unhexdump/parser.rb (numbers = rest.scan(/ ( )|([^\s]+)/))
• lib/ronin/support/encoding/base16.rb (data.scan(/../).each do |hex_char|)
• lib/ronin/support/encoding/hex.rb (data.scan(/../) do |hex|)
• lib/ronin/support/encoding/sql.rb (data.scan(/../) do |hex_char|)