master v20200909.2

Continuous integration build 1999, based on Superbuild 20200907.

All changes since master v20200613.1

Changes:

• Let the view follow the GNSS position, aka "Tourist mode" (GH-987)
• Paint-on-template changes (background and pattern drawing (GH-1242), redesigned menu (GH-1710))
• Style updates for improved touch mode usability (GH-1711)
• Initial PDF template support (via GDAL and Poppler, work in progress)
• Fix DPI selection for image export (GH-1271)
• Fix for area hatch/structure north orientation on OCD file import (GH-1677)
• Fix positioning of OCD templates on OCD file import (GH-1302)
• Fix some rare crashes and quirks
• Updated build tools and third-party components, including PROJ, GDAL, Qt (cf. Superbuild link)