Added Custom Performance Monitor

Trigger broadphase update when changing collision layer/mask.

VideoPlayer: fix possible race condition

X11: Ensure XGetWindowProperty data gets freed

Custom monitors can be added/removed/checked using `Performance.add_custom_monitor`/`Performance.remove_custom_monitor`/`Performance.has_custom_monitor`

The value can be viewed in the `Monitor` tab of Debugger.

Text before `/` is used to categorize the custom monitor.

`EditorPerformanceProfiler` class is created to separate logic from `ScriptEditorDebugger`

User can click on the graph of monitors to read the value at that point.

Graph includes intermediate base lines.

And cleanup includes a bit.

Remove unused interpolate camera icon

Fix possible accidental duplication of Polygon2D start point

Improve the preload and load descriptions

Fix weekday calculation in get_datetime_from_unix_time for negative times

Fix calculation for negative times to ensure Sundays are wrapped around to '0'
instead of '7', making it consistent with the output for positive times.

In set_stream() we write to 'playback' while accessing the same object
in _mix_audio() in audio thread. Protect the 'write' part in
set_stream() to avoid possible crash in _mix_audio() function.

SDFGI: Slight occlusion improvements.

Fix the logic to enable focus awareness

VideoStreamGDNative: close file in cleanup()

We should close the file handle when we are done.

Generate inspector preview for Image resources

QuickOpen improvements

check for collision layer/mask changes in 2D hash grid broadphase update.

Prevents usage of return in main shader functions

Call Node3D::get_global_transform and Vector3::dot only once within Camera3D::is_position_behind

Call Node3D::get_global_transform and Vector3::dot only once within Camera3D::is_position_behind to avoid redundant work.

Fixes recently introduced shader leaks

Make tilemap lines/rectangles their own tools

Keep the bottom panel visible when enabling the distraction-free mode

- Document the `EditorInterface.distraction_free_mode` property.

This closes https://github.com/godotengine/godot-proposals/issues/951.

Enable the ability to use Godot as a subview within an Android app

CanvasItemEditor: Fix losing position for drag'n'dropped scenes

Addition of SDFGI for open world global illumination

Move GI to a deferred pass

Don't use arbitrary theme editor icons for scripts with the same name