Stopped cache being located/created in a stupid place, relative to the CWD on the cache drive. Work around limitation of ant-contrib regular expressions, so they're not thwarted by \s in the cache location property.

Add missing / Avoids potential problem of it not seeing an existing cache, depending on the CWD on the cache drive at the point the target is running (which could be anything really).

Turned on use of cache for all platform builds (unless over-ridden by the particular job properties of course).