ddpg_bespoke: CLI command for the bespoke parser

Signed-off-by: Peter Williams <pwil3058@gmail.com>
bespoke: move writing of generated grammar module into Grammar

Signed-off-by: Peter Williams <pwil3058@gmail.com>
bespoke: start debugging errors in generated grammar

Signed-off-by: Peter Williams <pwil3058@gmail.com>