#93 switch-buffer default to lowercase

Similarly to isearch, I'd like switch-buffer to compare things lowercase-only unless an uppercase character is input.

Not sure I'm going to do this because sometimes you want it to be lowercase only and uppercase only...

This issue might be changed to something else. I'm not planning on adding fuzzy search. I'd like a way to list the buffers and be able to select them somehow.

To reduce complexity, what I don't want:

• msgline to be expandable
• buffer-list buffer (or other interactive buffers)
• print the list at point
  • the issue here is that now you have to make 2 actions or even 3 actions just to select the buffer. For example, if you C-x b and couldn't find the buffer then you'd have to C-g, print it at the point, copy it or just note it mentally, delete the list, then C-x b and paste it or tab it.
• long horizontal list in the msgline.