[FEATURE] Remove c++ geometry snapper plugin

All functionality is now available through analysis lib + processing
algorithm.

Marked as feature for documentation + changelog flagging

debian/qgis.install

@@ -11,7 +11,6 @@ usr/lib/qgis/plugins/libroadgraphplugin.so
 usr/lib/qgis/plugins/libheatmapplugin.so
 usr/lib/qgis/plugins/libtopolplugin.so
 usr/lib/qgis/plugins/libgeometrycheckerplugin.so
-usr/lib/qgis/plugins/libgeometrysnapperplugin.so
 usr/lib/qgis/qgis_help
 usr/share/pixmaps/
 usr/share/applications/

ms-windows/osgeo4w/package.cmd

@@ -395,7 +395,6 @@ tar -C %OSGEO4W_ROOT% -cjf %ARCH%/release/qgis/%PACKAGENAME%/%PACKAGENAME%-%VERS
 	"apps/%PACKAGENAME%/plugins/spatialqueryplugin.dll" ^
 	"apps/%PACKAGENAME%/plugins/topolplugin.dll" ^
 	"apps/%PACKAGENAME%/plugins/geometrycheckerplugin.dll" ^
-	"apps/%PACKAGENAME%/plugins/geometrysnapperplugin.dll" ^
 	"apps/%PACKAGENAME%/qgis_help.exe" ^
 	"apps/%PACKAGENAME%/qtplugins/sqldrivers/qsqlspatialite.dll" ^
 	"apps/%PACKAGENAME%/qtplugins/designer/" ^

src/plugins/CMakeLists.txt

@@ -19,7 +19,6 @@ ADD_SUBDIRECTORY(topology)
 ADD_SUBDIRECTORY(offline_editing)
 ADD_SUBDIRECTORY(heatmap)
 ADD_SUBDIRECTORY(geometry_checker)
-ADD_SUBDIRECTORY(geometry_snapper)
 
 IF (GRASS_FOUND)
   ADD_SUBDIRECTORY(grass)