Keying on XTypeProvider::getImplementationId is unnecessary here

...given that cases where "every instance of getPropertySetInfo returns a new
object [...] must not be cached" anyway, so just key on the XPropertySetInfo
instances.

Change-Id: I11f0a1fe030226d1d26d6b6e6a2654f4511fdce8
Remove unused util.dbg.getImplID

Change-Id: I2c662698146120924e8d3807547727d62155b024
Use cppu::OImplementationId for XUnoTunnel IDs

Change-Id: I564ec761b7a7b3488682acfb3aff56beb3f68213