osslsigncode: add libgsf optional dependency.

Closes #26009.
Closes #26026.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
bottle: use new quoting style.
CONTRIBUTING: shorten troubleshooting wording.
README: remove `brew server`.
README: add troubleshooting.
Add Formula directory README.
primesieve 5.0

Closes #26025.
wget 1.15

Closes #26034.
dart 31822

Closes #26035.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
guile: add test
keg: add function to detect if .app(s) installed.
caveats: print .app caveats if installed to keg.
avidemux: remove duplicated .app caveats.
cppcheck: remove duplicated .app caveats.
djview4: remove duplicated .app caveats.
emacs: remove duplicated .app caveats.
fontforge: remove duplicated .app caveats.
frescobaldi: remove duplicated .app caveats.
graphviz: remove duplicated .app caveats.
jstalk: remove duplicated .app caveats.