This adds some new customization associated with the introduction of
subsections indicator:
- it allows to display or hide them
- it allows to change the associated symbology
This adds support to display vertices lines over the profile graph to
display indicator at the location of the curve's vertices.
This is achieved with mainly 2 changes:
- `setSubsectionsSymbol()` allows to set the line symbol of the
vertical lines
- Call `renderSubsectionsIndicator` on the `QgsProfilePlotRenderer`
This adds support to display vertices lines over the profile graph to
display indicator at the location of the curve's vertices.
This is achieved with mainly 2 changes:
- `QgsProfilePlotRenderer::setSubsectionsSymbol()` allows to set the
line symbol of the vertical lines
- `renderSubsectionsIndicator` generates and renders the vertical
lines. It is called by `QgsProfilePlotRenderer::renderToImage()`.
This is a new navigation mode for QgsCameraController which is meant to work
just like the terrain-based navigation mode, but for 3D scenes with globe.
Initially, the new navigation mode can handle:
- zooming in/out with mouse wheel
- orbit around globe when dragging with left mouse button pressed
- left/right/up/down keys to orbit around globe
- shift + left/right keys to change heading angle
- shift + up/down keys to change pitch angle
- page up/page down keys to increase/decrease elevation
For camera pose, we use QgsCameraPose as for "flat" scenes, but the QCamera
is positioned/rotated slightly differently - the main change is that in case
of globe, we use ECEF coordinates of the camera pose's center point, convert
them to lat/lon coordinates in order to set up initial rotation of the camera
so that it is perpendicular to the tangent plane at the given ECEF coordinate.
