Using `clang-tidy`'s `modernize-use-default-member-init` check and
manual review of the changes, and some extra manual changes that
`clang-tidy` failed to do.

Also went manually through all of `core` to find occurrences that
`clang-tidy` couldn't handle, especially all initializations done
in a constructor without using initializer lists.

range() with non-numeric const argument crash fix

regression: var declaration type info parser bug fix

regression: static func can't access const fix

Rename the editor action "Revert Scene" to "Reload Saved Scene"

Support SDL2 half axes and inverted axes mappings. 

Make it clear that PhysicsDirectSpaceState is only available from within _physics_process().

WebSocket profiler for HTML5 platform [4.0]

Fix minimap selection offset

It is now possible to register protocol handlers (default tcp://) to
support additional debugging communication layers (e.g. websocket).

This option can be used to workaround various issues with stuff
not reloading properly when changes are made.
The option was renamed to clarify the fact that it actually
reloads the scene saved on the filesystem.

within _physics_process().

Compilation database support - clang, gcc, mingw

This tool is originally from mongodb.

- Updated CPPSUFFIXES to use scons suffixes
- objective-c files will also be loaded into the compilation database where the compiler / tooling is available to compile the files.

Known limitations:

- This will not work with msvc as your compiler.

Can be manually set, let's not pollute them further.
Should also be done for WebRTC.

Silence EQ::Band::c1, c2 and c3 may be used uninitialized warnings.

Rename SSL certificate bundle setting to clarify the "overriding" aspect

Fixes memory leak with lightmap part 2

Mark `*.tza` files as binary in `.gitattributes` for old Git versions

This closes https://github.com/godotengine/godot-docs/issues/2531.

Adds API changes from the new GPU lightmapper.

Update the editor icons README to remove outdated information

Better file naming for AppVeyor artifacts

This prevents `thirdparty/oidn/weights/rtlightmap_hdr.tza` from always being
considered as modified when using an old Git version (such as the one on
Ubuntu 16.04).

This closes #38684.

Rename various TileMap methods/properties for clarity and consistency

Tweak the error message displayed when a post-import script fails

Fix memory leak with light maps

See #38662.

Fix 'physicsw' may be used uninitialized warning in csg_shape.cpp