This pretty much reworks the entire icon system. Some notable changes:
* The extensions are put into a statically generated hash-table instead
of a sorted array. We use Robin-Hood insertion to reduce the max probe
length. Currently we need to probe only 2 slots for `O_EMOJI` and only
3 for `O_NERD`/`O_ICONS`.
* I've opted not to use a perfect-hash since the perfect hashes
generated by [`gperf`](https://www.gnu.org/software/gperf) used some
huge lookup table. The hash function also wasn't as minimal as I'd
like.
* Colors are now using X-Macros. This should speed up startup since we
don't have to search `icons_ext` linearly to find unique colors.
* The hash-table generator outputs a more space optimized `struct
icon_pair` using a char array instead of char pointer. This brings
down the binary size from `145KiB` when using `O_NERD` down to
`137KiB`.
* Some unnecessary duplication and indirection has been reduced by using
the `ICON_STR()` macro.
I've extended the use of nerdfont icon for tex to other common tex extensions.
I don't know how to do the same for icons-in-terminal.
Additionally, since the list is growing I have alphabetize the list of common
icons, used in icons-nerdfont.h.
* Add icons
* Fix build break
* Fix icon position in detailed mode
* Various fixes
* Provision for icon specific colors
No icons with oldcolor. Small optimizatons
* Update Makefiles
Small refinement for other matching