- made const NotcursesOptions constructors.
- refactor Notcurses constructors to return NcResult.
- pass NotcursesOptions by value, since it's Copy.
- update tests.
- add helper modules for Notcurses & NcPlane.
- new initialization functions to be used in tests.
- BONUS:
- refactor NcDirect
- update examples.
- fix notcurses_init unit test
- fix fn call name: `nplane_at_cursor_cell` → `ncplane_at_cursor_cell`.
- make LIBC_FILE & NC_FILE type aliases with doc comment.
- add lib module comment.
- improve direct-cursor example.
- fix full-text example and rename it to full-basics.