This PR continues the work started in PR #8951.
This commit replaces occurences of #include "qgis.h" by #include "qgis_sip.h",
where possible = when files only depends on SIP_XXX features.
Adds two new algorithms which expose QgsGeometry's methods
for segmentizing curved geometries.
"Segmentize by maximum distance":
The segmentization is performed by specifying the maximum
allowed offset distance between the original curve and the
segmentized representation.
"Segmentize by maximum angle":
The segmentization is performed by specifying the maximum
allowed radius angle between vertices on the straightened
geometry (e.g the angle of the arc created from the
original arc center to consective output vertices on the
linearized geometry).
