- several all-the-icons references were missed, and some code points are
different in nerd-fonts. the variable icon became a folder, the
package icon became a scissors, and the file-icons font icon is not
available
- make face link type face passthrough work
- remove extraneous rear-nonsticky and height properties that nerd-icons
already sets
- generally improve consistency across link types
- material design icons, underlines, and font lock faces for symbols,
shadow if unbound
- octicons for packages, modules, and executables, blue links if
installed, shadow if not. color coded icon based on status
- refactor and remove extraneous code
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