Remove unnecessary memoization from FormulaInstaller#build_argv
Reduce the number of ways options can be passed to the installer
Let commands decide what mode the installer should use
Fix typo
libpng 1.5.18
sbcl: 1.1.16 and a more rigorous test

Closes #27132.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
add check for /Library Python

Closes #24788.
Move wkhtmltopdf to the boneyard

Closes #26813.