Lots of small updates:
* Fix modtime format to show time not just "today". Make fixed font.
* Zebra stripe rows
* Fix .yml files to be detected as yaml
* Add a new config option for changing the default sort (Name vs Mod
Time)
* Add ability to change the defaults using the context menu
* Make Size column fixed font
* Add vertical bars between header columns (more visual resize handles)
9ee654dd6e