We now require a compiler with C++17 support, so we don't need to
check for features added to GCC 5 or Clang 3.2.

Clang builtin availability checks were unused anyway as Clang defines
`__GNUC__` as it's also a GNU C implementation.

Fixes #36986.

New contributor added to AUTHORS:
@muiroc

Thanks to all contributors and donors for making Godot possible!

Sorry for the late March update and missed February update, I made sure
to include patrons for both February and March in this commit.

Linux: Add Mesa 20 "Intel" to prime detection

Diff in `glxinfo` between Mesa 19.3.4 and 20.0.1:
```diff
-OpenGL vendor string: Intel Open Source Technology Center
-OpenGL renderer string: Mesa DRI Intel(R) HD Graphics 630 (Kaby Lake GT2)
-OpenGL core profile version string: 4.6 (Core Profile) Mesa 19.3.4
+OpenGL vendor string: Intel
+OpenGL renderer string: Mesa Intel(R) HD Graphics 630 (KBL GT2)
+OpenGL core profile version string: 4.6 (Core Profile) Mesa 20.0.1
```

Allow single quotes [',"] in comments in TextEdit

Resurrect HTML5 platform, add it to CI (no rendering yet)

Fixes: #36638

GDScript duplicate arguments bug fixed

fix: Classes can't have pass 

Fix: logic error in gdscript_parser.cpp for-loop-range

Fix -Wshadow=local warning in EngineDebugger

Made snap relative work on rotation as well

This reverts commit c924e83a.

SCons `FRAMEWORKS` is, according to their latest docs, only supported
"On Mac OS X with gcc". While the "with gcc" part seems bogus, #36795
did introduce a link failure for our osxcross toolchain for compiling
macOS binaries from Linux. SCons probably fails to detect this as a
macOS target and does not use its `FRAMEWORKS` logic properly.

So using `LINKFLAGS` as we used to is the more portable solution.

mbedtls: Re-add patch to disable VIA padlock

The comment mentioned a conflict with libwebsockets, but we actually
still get this conflict even now that we don't use libwebsockets.
Not sure what component is clashing but we should basically just keep
this patch.

Follow-up to #36823.

Revert "Enhanced physical device selection to use device type and available memory in relation to issue #35397"

This reverts commit 4f3006e5.

Initializes VulkanContext::queue_props to NULL

Fix "deploy with remote debug" editor option.

The line to update the option was missing (rendering it useless).
Of course the only one I didn't know how to test was broken.

ScriptDebugger refactor, threading, profilers.

mbedtls: Re-apply upstream PR 1453 after #36823

For some weird reason 'git apply' does not error out when it does nothing,
so I missed that I did not apply the patch properly in #36823...

This broke the UWP 32-bit x86 build.

vulkan: Re-add option to build Vulkan-Loader statically

change an exclamation mark to a dot

Upstream removed the option in KhronosGroup/Vulkan-Loader#260, which
breaks our current use case.
This commit reverts KhronosGroup/Vulkan-Loader#260 is our vendored
loader.

We may need to re-evaluate how we link the loader, but until then,
reverting this PR fixes Windows support after the upgrade to a recent
SDK version in #36932.

More explicit error messages when vulkan calls return errors

Update snap setting only with OK

Fix the VIEW_INFORMATION checkbox not being selected (visually)

Fix missing module editor icons

Complete NavigationMeshInstance rename

Move Debug menu logic to DebuggerEditorPlugin, allow 4 debug instances

Keeps the filename when marking scene as unsaved

Document known performance issues with Sprite3D

DocData: Fix serialization of Variant default values

Fix initialization of the GodotPayment plugin