Add an invert checkbox for heatmap renderer
fix windows build
[processing] fix Field calculator algorthm (fix #11488)
[processing] redirect output from command line tools to Info tab (fix #5618)
Fix #9604 - New icon for delete selected features
travis: disable qgis_wcsprovidertest due to unreliable server
restore setting of scene to map canvas items (followup 78c51954)
update INSTALL (fixes #11715)
- remove outdate "practical case" section
- include pointer to GDAL formats for build instructions for proprietary
  formats in overview
- cosmetics
better fix for b99ab0a
getProjectSettings response: return 'maptip' instead of tooltip template as
displayField layer attribute
Add support for weighting points by expression to heatmap renderer
[layout] Add layout measurement and size classes

These classes are used for storing measurements for a layout
(QgsLayoutMeasurement) and sizes for a layout (QgsLayoutSize).
They support storing a measurement unit alongside a measurement
length/size. A new class QgsLayoutMeasurementConverter handles
conversion between different units, including converting to and
from pixels via a specified DPI property.
[layout] Create a page size registry for layout

Adds a new QgsPageSize class and QgsPageSizeRegistry singleton,
which stores and manages known page sizes
[layout] Add base classes for layout
[layout] Add measurement unit handling to QgsLayout
Start porting page items
Work on moving/resizing with units
[layout] Split unit classes into their own files
[layout] Ensure that moving/resizing items respects reference point
[layout] Create QgsLayoutContext class

Move layout rendering flags to QgsLayoutContext