Until now we had multiple maps, each for a specific ControlType
(maPushButtonDefinitions for example) which had multiple parts
identified by the string.
To simplify matters, this changes that we have just one map for
a specific ControlType and ControlPart which are identified by
ControlTypeAndPart structure.

Change-Id: I90a2e5c8f83d697d26049054eacab250e2768c03
Reviewed-on: https://gerrit.libreoffice.org/68690
Tested-by: Jenkins
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>