Update scorer for LMentry tasks

[vvchernov]

Get unchecked tasks from LMentry, analyze answers from model and correctness of their evaluation by scorer. Try to update the scorer if errors were found.

[pa-shk]

Improved patterns for the tasks rhyming_words and homophones

For the task rhyming_words old and new scores respectively:
0.6,47.8,47.6
0.6,48.9,47.6

For the task homophones old and new scores respectively:
40.0,36.2,59.5
40.0,36.5,59.5

#20