scsh: add HEAD

Closes #19071.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
jenkins 1.510

Closes #19072.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
dart 21094

Closes #19073.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
ezlupdate: update download URL

Closes #19075.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
ios-webkit-debug-proxy 1.1

Closes #19079.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
adobe-air-sdk 3.7

Closes #19076.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
Simplify these tests
Check existence rather than rescue exceptions
wip: first pass at fixing validation