replace getch to get_wch

breaks rspec
fix basic errors

rspec is still broken
fix broken rspec
Merge branch 'feature/refactoring_ncurses' into develop
Update documentation
Disable AccessMethodName cop for `get_wch`

Since its name is from Ncurses library.
Use proper return value for `get_wch`
Merge pull request #110 from yous/patch-rubocop

Resolve RuboCop offenses