[*] input.txt generator
[+] generate example by romaji
[+] generate example word opening by romaji portion
Merge branch 'generate_source_example_feature' into develop
[*] fix bug
[+] split node weight to word weight and variants weight
[*] remove additional iteration in word variants searching
[-] remove class for nodes collection
[-] remove unused libs
Merge branch 'refactoring_for_letter_node' into develop
Merge branch 'develop'