This commit introduces a new PathExt trait with a fn replace_env which
can ensure all environemnt variables are loaded for a PathBuf.
As part of the initial rollout this is used in komorebi-bar to look up
environment variables for the configuration switcher widget.
resolve#1131
This commit changes the way icons are displayed on the bar.
There was an issue with how app icons were sized using shrink_to_fit.
This has been changed to use fit_to_exact_size instead, relying on the
font size as a starting point and scaling it to 1.4 of its size, making
the icons to appear larger.
The same scaling was done to all the widget icons as well to make them
look unified.
Csaba