Revert "svx: split into direct implementation getFactories"

Also reverts "These services are in fact implemented in svxcore library."
This reverts commit 090674dcb085cd41f4628e4f07c9a2268a18e862
and commit 4a969ac35174520f1ffeb4f919f5d7bb6d99a628.

This is embarrassing; needs more work.