Changelog for QGIS 3.40
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* Map Tools : Respect layer/project vert datum in identify results

* Map Tools : Present referencing relations (in addition to referenced ones), and support them on arbitrary nesting level

* User Interface : Actions Dialogue Duplicate Button

* Symbology : Provide style categories for raster layers

* Symbology : Add "Linear Referencing" symbol layer type

* Symbology : [CMYK] Implement color ramp interpolation

* Symbology : [CMYK] Add a specific preview for CMYK color

* Symbology : [ColorWidget] Select color component as float

* Symbology : Allow end point marker symbols for balloon callout style

* Symbology : Buffers for marker symbols

* Symbology : Support tolerances for QgsRasterTransparency pixel values

* Annotations : Auto upgrade SVG and text annotations to annotation layer items on project load

* Annotations : Add support for callouts to point text, rect text and picture items

* Annotations : Add linked layer option for annotation layers

* Annotations : Text inside rectangle annotation item

* Annotations : Add picture annotation item type

* Labelling : [feature] Support horizontal alignment in HTML labels

* Labelling : [feature] Support h1/h2/.../h6 formatting in html labels

* Labelling : [feature] Add support for word-spacing CSS in html labels

* Labelling : Implementation of labeling engine rules

* Diagrams : Introduce stacked diagrams

* Mesh : Add GUI for adding Quantized Mesh layers

* Rendering : Support multiple URLs/sources for vector tiles

* 3D Features : Respect vector layer vertical crs settings in 3d map views

* 3D Features : 3D Scene Clip Distance

* Print Layouts : Add support merging cells in manual tables

* Print Layouts : [CMYK] Generate a valid PDF/X-4 file

* Print Layouts : Add option to set geospatial PDF group name for items

* Print Layouts : Added Page Properties qAction to layout main menu

* Print Layouts : Add scale method option for layout scale bars

* Expressions : Add 'Custom Expression' numeric format

* Expressions : Add line_interpolate_point_by_m and line_locate_m expressions

* Expressions : Add color_rgbf/color_cmykf/color_hsvf/color_hslf

* Expressions : Allow users to save expression functions in QGIS project file

* Expressions : Add info about usable "expression dialect" to filter dialog

* Expressions : [Expression] add project/ramp_color_object functions

* Digitising : Add circles intersection digitizing tool

* Digitising : [advanced digitizing] Implement visual construction guides

* Data Management : Allow setting VSI credentials when loading OGR/GDAL layers

* Metadata and Metasearch : Add metadata setting to override widget wrapper used for a parameter

* Forms and Widgets : Allow reordering fields in new vector layer dialogs

* Forms and Widgets : Support img tags in HTML label text

* Processing : [geometry] add support for polyhedral surface and TIN

* Processing : Processing Algorithm: Open file or URL

* Processing : Add processing parameter types for Area and Volume

* Processing : Enhance the GDAL "Vector information" alg and add a new GDAL "Vector information (JSON)" alg

* Processing : Allow adding Processing tools to Favorites

* Processing : Add creation options support to some native raster Processing algorithms

* Processing : Support drag and drop for multi-layer parameters

* Application and Project Options : [network] Implement a smart cache size

* Application and Project Options : Add an option to autosize all columns by default when opening an attribute table

* Application and Project Options : Add vertical CRS selection widget to vector layer properties

* Application and Project Options : [CMYK] Properties widget

* Profile Plots : Change elevation profile name

* Profile Plots : Ensure vector layer elevation profiles respect layer/map vert datums

* Browser : add UX to load MVT layers from style URL only

* Browser : Add duplicate functionality to Browser connection items

* Browser : Allow to create an empty GeoPackage from the context menu of the top-level GeoPackage node (fix #25116)

* Browser : Add connections to cloud storage providers to browser

* Browser : STAC core part one

* Data Providers : implement separate wfs title

* Programmability : Exceptions raised on QgsDistanceArea methods

* Programmability : Add Method to Convert QgsRasterLayer to NumPy Array

* Programmability : Implement QgsGeometry.as_numpy and .as_shapely