Split --cache flag

[dimadin]

Without researching, it's not clear what does --cache flag do. There are multiple types of possible caches (opcode cache, object cache, page cache), --cache name is too broad.

Another thing is that right now --cache enables both object and page cache, and there is no way to enable just one type.

This was mentioned in #50 (comment) by @kirtangajjar but it was not implemented in stable release and I see no other issue that tracks this feature.

[mrrobot47]

@dimadin It has been added to the Maintainance release pipeline and will be processed soon.