Squashed '$external/ProxyGenerator/' changes from c1facd8..cf66185

cf66185 added user-defined name for generated assembly (probably useful to InternalsVisibleTo)

git-subtree-dir: $external/ProxyGenerator
git-subtree-split: cf661853ad2df495344fd9bf6c616141ca898292
Merge commit '2419ccdf7f1f3b61312fcd0b8e6a8379fcbcd4b0'
minor fix