Initial script module for testing
Script object
Add signature script
Add all opcodes
Parse the script into chunks
Don't read stream, just parse the bytearray
Verify operation count
Check for disabled opcodes
Append data chunks to stack
Handle OP_IF
Handle more control operations
Implement flow control logic
Add MPI utils
Add has_length/include_length option for mpi converters
Handle value-pushing opcodes
Handle NOP opcodes
Add ScriptFailure exception type
Handle verification opcodes
Convert mpi to script numeric type properly
Raise exception on script num overflow