Initial port to Godot 4.2

[BlayTheNinth]

This isn't really a full port and I can't dedicate the time to make everything neat, so submitting it as a draft. Feel free to use as a base or build upon this.

The basics of the 2D demo are working in Godot 4.2 (via gdextension below, did not test gdnative). I was able to view the GitHub page, interact with it, and watched YouTube with both Video and Audio. The 3D demo was left untouched for now and I've only tested on Windows.

Changes

• Update GODOT_VERSION to 4.2
• GODOT_CPP_TARGET must now be either template_release or template_debug
• Removed GODOT_EXECUTABLE and generation of extension_api.json to use the one shipped in the godot-cpp repository instead
• Disabled the cef patches on Windows because they seemed to cause linking issues and it seems to work without now?
• Added "use_static_cpp=no" to godot-cpp build to fix dynamic vs static linking issues
• Updated 2D demo to be able to run successfully (however, I did not update or test any of the advanced features like the color picker)
• Updated the HelloCEF demo to be able to run successfully (however, the GUI seems to have gotten mangled a bit and I did not update or test anything in relation to that)
• Disabled arch_ext = '64' override on Windows as well since Windows builds now end in x86_64 - maybe this applies to linux too? not sure
• Added 'TYPED_METHOD_BIND' to defines to fix compile errors on Windows when returning GDBrowserView* in the bound createBrowser method
• Renamed gdextension.cpp to register_types.cpp to match the example on Godot docs and maybe fix a weird conflict error I ran into (but not sure if that did anything to help or it was something else)
• Added missing signal registration (taken from eProgD's fork 🙏)
• Fixed and re-enabled onPaint (with color correction taken from eProgD's fork 🙏)
• Instantiate GDBrowserView using memnew as otherwise the engine would consider it just an empty node
• Updated _process to now take a double for delta and remove it from bind_methods since it's an existing engine method
• Updated gdextension entrypoint to signature used in Godot 4.2

The barebones gdcef.gdextension I used for testing (obviously not using correct targets) is below. I also had to update the cef artifacts path to use that same bin folder but did not change this in the build script since it seemed more involved.

[configuration]
entry_symbol = "gdcef_library_init"
compatibility_minimum = 4.2

[libraries]
linux.x86_64.debug = "bin/libgdcef.so"
linux.x86_64.release = "bin/libgdcef.so"
linux.x86_32.debug = "bin/libgdcef.so"
linux.x86_32.release = "bin/libgdcef.so"

windows.x86_64.debug = "bin/libgdcef.dll"
windows.x86_64.release = "bin/libgdcef.dll"
windows.x86_32.debug = "bin/libgdcef.dll"
windows.x86_32.release = "bin/libgdcef.dll"

macos.debug = "bin/Frameworks/Chromium\ Embedded\ Framework.framework/Libraries/libgdcef.dylib"
macos.release = "bin/Frameworks/Chromium\ Embedded\ Framework.framework/Libraries/libgdcef.dylib"

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[Lecrapouille]

@BlayTheNinth Thank you ! Nice work. Of course, no problem to merge it inside the dev-godot-4 branch. I will test it on Linux. No worries if "something" broke ... since this branch is initially not working ;)

[Lecrapouille]

@BlayTheNinth I made commits on the master branch (godot-3.5) but also some cherry picking and fixes on the godot-4 branch. I added gdextension files, remove gdnative files. The window reshape was fixed on the master branch. The compilation of the 3d demo shall be fixed as well as the keyboard. Tested on Linux.