ROOT: use builtin GLEW

Closes #19724.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
Alias mosh -> mobile-shell

Closes #19729.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
Use subdirs to avoid checking for .DS_Store
upgrade: be more precise about what constitutes an installation
upgrade: use a method rather than a boolean flag
upgrade: this only deserves one line
formula revisions wip