This... Almost works?

This spits out links in VimWiki syntax, which is more readable and useful
in context than just a raw list of grep results.

(For the grep results, I could always use `gf` to jump to the file, but
it didn't then get added to the VimWiki location list, so the back command
wouldn't work.)

This also uses an sqlite query against an already-built table instead of
pawing through a bunch of files on disk, which is probably faster.

Just a quick index of logs, for the moment.

This is already handled in filter-exec-stdin, using IPC::Cmd, which may
be what I should do here, but I guess this is ok.

After reading:

https://post.lurk.org/@fragmentscenario/105901885046776610

...which it sometimes may not, if not properly mounted or whatever.

Gives an interface for controlling multiple audio channels / sinks.

- Uses LWP::Simple instead of shelling out to curl
  - Prints a one-line tab-separated thing for each post
  - Adds Getopt::Long and some usage info

https://mspsocial.net/@earthtopus/105059383725674327

The calendar one will get the entry syntax-highlighted correctly (it seems
to pick a syntax based on the last string).

The log one will work from any directory.

This involves changing grepprg, running, and then changing it back.

Not entirely optimal, but the location window has some good features.

Changes notes-links-for output to match (ish) grep format.