* Add label rendering into VPC tiles
* Move tile labels rendering into QgsPointCloudExtentRenderer
* Rework showLabels flag once more & connect it to widget
* Add widget for label TextFormat WIP
* Rework and fix text format widget issues
* Improve default text format used in VPC labels
* Fix banned keywords issue
* Fix QgsTextFormat review issue
* Fix labels drawing efficiency issue
* Fix formating issues
* Fix review issues
- Add enums to qgis.h instead of qgscoreenums, so that they belong to
a Qgis namespace
- Split up the various symbol headers into multiple files so that we
can fine-tune their inclusion and forward declare more readily, speeding
up recompilation
- Move QgsSymbol enums to qgis
Useful when you just want an overview of the bounds of the layer in a
2d map. Also potentially usable as a temporary renderer for las/laz
files while we build the indexed representation of the file in the
background.