GPKG: add support for creating spatial index

git-svn-id: https://svn.osgeo.org/gdal/trunk@27333 f0d54148-0727-0410-94bb-9a71ac55c965
GPKG: fix renaming of layer w.r.t spatial index tables/triggers

git-svn-id: https://svn.osgeo.org/gdal/trunk@27334 f0d54148-0727-0410-94bb-9a71ac55c965
Merge branch 'trunk' into trunk_android