[io][pointcloudwriter] Misc. fixes
See merge request !1760 (merged)
(cherry picked from commit 114e568d)
7591eee1 [io][pointcloudwriter] Fix output of 3d vectors and includes 5f665e56 [io][pointcloudwriter] Only close PointData tag if there acutally are point data 745b891d [io][pointcloudwriter] Rename DimVector to DimWorldVectorDimVector and fix includes