Added install resources configuration as complement to runtime resources

Simple extension, as yet unused by any entities. Allows files and templates to be configured in a blueprint for copying before installation tasks execute. Also moves creation of directories for install and runtime before resource copying.
I only _just_ added the `RESOURCES_LATCH` and associated runtime resource copying during 0.7.0 in the past month, so I think we can get away without deprecation, although maybe adding `@Beta` would be useful.