[High priority] Data generation, tokenization and BPE missing

[jm-glowienke]

• [x] include dashes in queryies --> this maybe solves https://github.com/DeNederlandscheBank/nqm/issues/15
• [x] Tokenize and detokenize filled nl questions using Moses
• [x] Change handyish tokenization for SPARQL queries, include quoatation marks
• [x] Add BPE --> will probably improve perfomance, frequent patterns are simplified

[jm-glowienke]

• [x] Clean up folders,
• [x] Clear up script