URL improvements: castle-config:/ protocol, use UriExists and FindFiles on any URL (i

[DP News-Robot]

We present a number of improvements to our URL system, which is the basis for all engine resource loading and saving: We introduced castle-config:/ URL protocol, to save files in a system-specific place (directory) that is “persistent” for given user. It points to a specific directory that is by convention writeable and should be used …