Change some default settings

- File browser placed on right.
- HTML output placed in new window.
- Theme set to Twilight.
Only underline matched characters

We now drawn the full string with same color and font.

Path shown in status bar is not marked up at all.
Make file chooser a floating panel

Also disable our “render as active” code for the table view when the window is not key.
Provide singleton API for FileChooser

You can still create multiple instances, but would generally not want to.
Checkin release notes