Fix potential crash when listing leaked objects

Note:
Casting to the C++ classes and calling the methods there would work as well,
but would require including he header files for the specific object types handled
here, which wouldn't be OK either.

Improve the 3D light documentations

SCons: Dump construction environment to a file

A new `methods.dump(env)` is added to dump the construction environment
used by SCons to build Godot to a `.scons_env.json`. The file can be used
for debugging purposes and any external tool.

Document the requirement to update the class reference when contributing

See https://github.com/godotengine/godot-docs/issues/3670.

Tree: Calling update in _gui_input less frequently

Fix signal duplication bug when duplicating node with instanced children

AStar: Make get_closest_point() deterministic for equidistant points

doc: Make File store/get integer methods clearer

Fix crash when creating new text file with no name

Fix scene tree showing up when the root selection is present

Documenting new additions has been an informal requirement for
a few months now. This makes it official.

Mention ordering caveats for `Dictionary.hash()`

See https://github.com/godotengine/godot/issues/27615.

Add an example on how to store signed integers on less than 64 bits,
using one bit for the signedness.

Change error checking in `duplicate_signals()` to check for path to
`p_original`, thus adhering to the method used in `duplicate`, instead
of checking for ownership.

Change the default editor camera rotation to position it in +X +Y +Z

Add generic file icon and its modulation to the 'FileDialog'

Core: Add hints to run with --verbose when leaking nodes/resources at exit

Test collision mask before creating constraint pair in Godot physics broadphase 2D and 3D.

Update Rigidbody 2D and 3D sleep documentation.

Tweak the invalid preset error message to mention `export_presets.cfg`

Closes godotengine/godot-docs#3667.
Supersedes #39405.

PackedScene: Prevent crash when root node has `parent` attribute

GDScript LSP: Fix crash in notify_client

Removed variables in EditorSceneImporterAssimp::import_scene that became unused.

Respect 'mesh compression' editor import option in Assimp and glTF importers [master]

VariantParser: Fix crash on malformed vectors

The crash happens further down when setting an invalid owner in
`Node::_set_owner_nocheck` but I couldn't figure out how to fix it.

But here the proper fix is to catch the invalid scene file early on
and fail loading it.

Part of #17372.

Each time `r_err_str` is set, we should return a parse error.

Removed redundant `return OK;` which were already handled after the big
`if`/`else if`/`else` for `TK_IDENTIFIER`.

Part of #17372.

`latest_client_id` now defaults to `-1` (invalid ID) instead of `0`.

Also fix typo in notification `gdscrip_client/changeWorkspace`,
and fix argument names in method binds.

Fixes #39375.