This commit adds a new option for showing annotation layers in 3d maps.
From the annotation layer properties, 3d tab, users can set the layer
to render as 3d billboards. When activated, all MARKERS from the layer
will be shown as floating billboard symbols above the 3d map. (lines,
polygons, and text items from the layer are ignored).
Users have control over the terrain clamping and offset for the
billboards, and whether or not "callout" lines should be shown (vertical
lines joining the billboard to the corresponding location on the
terrain surface)
This is a mix of additions and updates for the initial support of globe mode
in 3D views within QGIS desktop app. Many things are still missing, and will
be introduced in later PRs...
This introduces a new class QgsGeoTransform (derived from QTransform)
that keeps chunk's translation vector as a QgsVector3D (i.e. in double
coordinates) and if there is a shift of the origin, 3D map scene and
chunk entities react to it by adjusting the underlying QTransform.
sip doesn't use the standard Python staticmethod type for defining
static methods, which means that standard means of testing
for a static method (like `isinstance(..., staticmethod)`) fail
with any PyQGIS static methods.
This causes issues with lint tools, which incorrectly flag
calls to QGIS static methods as missing self arguments. It also
breaks detection of static methods in the sphinx PyQGIS docs,
so all static methods are shown as non-static.
Work around this in sipify, by wrapping unambiguously static
methods in staticmethod wrappers.
