Refactor (and fix) how the connect button is disabled.

Travis: Disable -Wstrict-aliasing warning on GCC 5 test build

Disabled array initialization, const array and arr.length in GLES2 shaders

Should speed up builds by avoiding warning spam.
This warning is no longer raised by newer GCC versions.

It should not be possible to click the "Connect" button unless

  - a node is selected, and
  - that node is valid in the current mode.

The modes are the default and advanced modes which allow connecting to scripts
and nodes respectively.

Prevent crash described in #34555.

MinGW: Avoid GCC -Wcast-function-type warnings on GetProcAddress

Using the same method as GNUlib and various other projects.
https://lists.gnu.org/archive/html/bug-gnulib/2018-08/msg00109.html

The warning is valid, but there's no way around it since the issue
comes from the Windows SDK. It's also harmless in this case.

Part of #29801.

Validate input in (CPU)Particles set_emission_shape()

Fixes #29777.
Co-authored-by: Cameron Reikes <cameronreikes@gmail.com>

Fix light related crashes

Use int64_t for EditorPropertyInteger and warn when out of double range

Fix scrollbar regression on large scales

Updates ScrollContainer min size when toggle scrollbars

Fix Vsync Via Compositor causing halved refresh rate when vsync is forced by the graphics driver

Fix array constructor for lightmaps

Add background mode keep to GLES2

Mono/C#: Fix false positive in unsafe reference checks

Add check to prevent compositor sync if the graphics driver is forcing vsync.

Fixes #35038.

(Addendum: this PR does not negatively impact users unaffected by #35038.)

Fixes a memory leak in FileSystemDock

Add an icon for OGG samples

The icon is the same as WAV samples, as both formats are accepted
in AudioStreamPlayer.

This closes #35163.

Co-authored-by: Rafał Mikrut <mikrutrafal54@gmail.com>

Fix GridMap getter of baked meshes.

Mono: Fix parsing assembly names as UTF-8

Fixes AssetLib crash when JPG module is disabled

JPG module is optional, so check it's existence before using.

Fixes get_floor_normal() returning the user defined floor_normal.

Don't close the connection dialog when the validation failed.

Fixes #27185.

Currently the connection dialog is closed when

 1. no method name is specified, or

 2. no script is attached and if the method name isn't a buildin.

That's really annoying.