Add c16:uniqueId for CT_DPt and CT_LegendEntry

[tomjebo]

Add the following c16:uniqueId extension child patches:

CT_DPtExtensionList/CT_DPtExtension
CT_LegendEntryExtensionList/CT_LegendEntryExtension

These are already in the O16 patch file on the backend, just uncomment for v4.0.

Related bug:

• c16:uniqueID element has wrong case #1762

Also remove:

obsoleted pictureOptions from CT_LineSer, CT_RadarSer, CT_PieSer, CT_BubbleSer and CT_SurfaceSer
obsoleted bubble3D from CT_SurfaceSer

these children have been removed in the latest Office schemas.