SSViewer template cache can't be configured

[halkyon]

Currently it's using a hand-rolled caching solution that puts the template caches into TEMP_FOLDER/.cache.x.x.x.Filename.ss etc. There's no way to configure that.

Would be ideal if we could use SS_Cache for this, so the caching can be configured. For example, you might want to put all the cached templates into APC, and/or set a different cache lifetime. It's generally a much nicer solution than a hand-rolled cache. If the overhead of Zend_Cache is too much, I suggest we compromise with something like ManifestCache, which hand-rolls it in a way that's more configurable, obviously benchmarks would determine that decision.

Note that SSViewer::getPartialCacheStore() currently uses SS_Cache. I wonder if that could be combined.