more gradual scrolling

[travisstaloch]

Scrolling up/down only happens a page at a time and makes reading awkward at times, especially when paging through large outputs. I wish cm would scroll more gradually like my terminal (in smaller increments).

Not sure if these are applicable, i started looking into how to implement this:

• https://docs.rs/ncursesw/0.5.1/ncursesw/?search=scroll
• https://www.mkssoftware.com/docs/man3/curs_scroll.3.asp

[rexim]

@travisstaloch I tried to address this issue in #219. Please check out the latest commit and close this issue if it works for you.

[travisstaloch]

Looks good to me! 😄 Much easier to read now. Thanks so much!