Force using floats in cubemap coefficient

Added tests for ClassDB

Add night sky to PhysicalSkyMaterial

Fix certain characters being recognized as special keys on Windows when using the us international layout

Remove no longer needed patch to jpgd.cpp

SCons: Improve registration of compilation_db tool, check version

Fix certain characters being recognized as special keys in Windows when using the us international layout

Fix leaks and crashes in OAHashMap

There's a builtin `toolpath` option we can use for that, so no need to hack
around a custom `scons_site` path.

The script requires SCons 3.1.1 or later, so we enable it conditionally.

Follow-up to #32848.

This changes the way the lifespan of items is managed to be consistent.

Bonus: Simplify cases of destroy-then-emplace.

AudioDriverJavaScript buffer size calculation.

GLSL: Change shader type specifier from [vertex] to #[vertex]

Each driver used to define the (same) project settings values
`audio/mix_rate` and `audio/output_latency`, but the setting names are
not driver specific.
Overriding is still possible via platform tags.

Based on mix rate and expected latency.

The added `#` prevents clang-format from misinterpreting the meaning
of this statement and thus messing up the formatting of the next
lines up until the first `layout` statement.

Similarly, a semicolon is now enforced on `versions` defines to
prevent clang-format from messing up formatting and putting them
all on a single line. Note: In its current state the code will
ignore chained statements on a single line separated by a semicolon.

Also removed some extraneous lines missed in previous style changes
or added by mistake with said changes (e.g. after uniform definitions
that clang-format messes up somewhat too, but we live with it).

Add more missing node icons

Add `custom.py` to .gitignore

The default `custom.py` can be created at the root of the Godot
repository to initialize any SCons build options via file which are
specific to user.

Allow searching with keyboard input by default in PopupMenu

Clarify that variables pointing to an object don't become `null` when that object is freed, it just makes them invalid.

(cherry picked from commit ccf5703568ab7c33723f322088c83a7d9ebcf5a8)

See discussion in https://github.com/godotengine/godot-proposals/issues/43.

Implementation of the Godot Android Plugin configuration file

Document that Dictionary is always passed as reference

Replace 'add_child_below_node' with 'add_sibling' in Node

Fix popup window size calculation in popup_centered_ratio by using Rect2

See #38792.

Fixed text editor drawing if smooth scrolling is disabled.

Fix input event being dispatched multiple times on Windows

Fix GDNative wrapper type sizes (RID, Variant, Packed*Array), add size checks.

Remove HQ2X and the `Image.expand_2x_hq2x()` method

Fixes #38778

As of Godot 3.0, HQ2X is no longer used to upscale the editor theme
and icons on hiDPI displays, which limited its effective uses.
HQ2X was also used to upscale the project theme when the "Use Hidpi"
project setting was enabled, but results were often less than ideal.
The new StyleBoxFlat and SVG support also make HQ2X less important
to have as a core feature.

This decreases binary sizes slightly (-150 KB on most platforms,
-212 KB on WebAssembly release).

This partially addresses #12419.

Remove get_local_mouse_position() hack in GraphEdit