rip out all remaining uses of svxform::OTypeConversionClient and remove it

It just wraps around dbtools, which is linked directly now.

Change-Id: If8d281962018a48a54858421e3490f5032658691
remove ::svxform::OStaticDataAccessTools from DbCellControl

Change-Id: Icd93a418fad8c9f05b49fcd412a1e2ba4b9c240b