CMake: Introduce Presets, replacing Settings

This introduces a CMakePresets file for both Unix-likes and Windows that replace the old CMakeSettings.

It adds presets for **Debug** and **Release** profiles for both **x64** and **ARM64** architectures, as well as **Generic builds**.
Presets can be used using[ Visual Studio's built-in CMakePresets support](https://learn.microsoft.com/en-us/cpp/build/cmake-presets-vs?view=msvc-170), or [Visual Studio Code's CMake Tools](https://marketplace.visualstudio.com/items?itemName=ms-vscode.cmake-tools) extension.

They can also be used from the command line, like so:

- x64/Unix-like/Ninja:
  - Configure: `cmake --preset ninja-release-x64`
  - Build: `cmake --build --preset ninja-build-release-x64`
  - Configure + Build: `cmake --workflow --preset ninja-release-x64`
- ARM64/Windows/Visual Studio:
  - Configure: `cmake --preset visualstudio-release-arm64`
  - Build: `cmake --build --preset visualstudio-build-release-arm64`
  - Configure + Build: `cmake --workflow --preset visualstudio-release-arm64`

The Ninja generator is available to both Windows and Unix-likes, while the Visual Studio Generator is only available on Windows.

**Cross-compiling**

On **Windows**, the Visual Studio generator automatically takes care of everything, you just need to select an ARM64 preset.

On **Unix-likes**, to cross-compile you need to install a cross-compiler and (optionally) a sysroot of the target system.
Here is an example to compile from x64 to ARM64 with a sysroot:

- `cmake --preset ninja-release-arm64 -DCMAKE_C_COMPILER=aarch64-linux-gnu-gcc -DCMAKE_CXX_COMPILER=aarch64-linux-gnu-g++ -DCMAKE_SYSROOT=/opt/sysroots/aarch64-linux-gnu`
- `cmake --build --preset ninja-build-release-arm64`

You will need a sysroot to link against Qt, since we do not vendor it in on platforms other than Windows.

**User presets**

A `CMakeUserPresets.json` file may be created locally at the root of the project to further customize your presets.
For example, here are the user presets I used to test this PR on Arch Linux with a generic Arch Linux ARM sysroot:

```json
{
  "version": 10,
  "configurePresets": [
    {
      "name": "gcc-debug-arm64",
      "inherits": "ninja-debug-arm64",
      "cacheVariables": {
        "CMAKE_C_COMPILER": "aarch64-linux-gnu-gcc",
        "CMAKE_CXX_COMPILER": "aarch64-linux-gnu-g++",
        "CMAKE_EXE_LINKER_FLAGS": "-L/opt/sysroots/ArchLinuxARM/lib",
        "CMAKE_SYSROOT": "/opt/sysroots/ArchLinuxARM"
      }
    },
    {
      "name": "clang-debug-arm64",
      "inherits": "ninja-debug-arm64",
      "cacheVariables": {
        "CMAKE_C_COMPILER": "clang",
        "CMAKE_CXX_COMPILER": "clang++",
        "CMAKE_C_FLAGS": "-target aarch64-linux-gnu",
        "CMAKE_CXX_FLAGS": "-target aarch64-linux-gnu",
        "CMAKE_SYSROOT": "/opt/sysroots/ArchLinuxARM"
      }
    },
    {
      "name": "clang-debug-x64",
      "inherits": "ninja-debug-x64",
      "cacheVariables": {
        "CMAKE_C_COMPILER": "clang",
        "CMAKE_CXX_COMPILER": "clang++"
      }
    }
  ],
  "buildPresets": [
    {
      "name": "gcc-build-debug-arm64",
      "configurePreset": "gcc-debug-arm64"
    },
    {
      "name": "clang-build-debug-arm64",
      "configurePreset": "clang-debug-arm64"
    },
    {
      "name": "clang-build-debug-x64",
      "configurePreset": "clang-debug-x64"
    }
  ],
  "workflowPresets": [
    {
      "name": "gcc-debug-arm64",
      "steps": [
        { "type": "configure", "name": "gcc-debug-arm64" },
        { "type": "build", "name": "gcc-build-debug-arm64" }
      ]
    },
    {
      "name": "clang-debug-arm64",
      "steps": [
        { "type": "configure", "name": "clang-debug-arm64" },
        { "type": "build", "name": "clang-build-debug-arm64" }
      ]
    },
    {
      "name": "clang-debug-x64",
      "steps": [
        { "type": "configure", "name": "clang-debug-x64" },
        { "type": "build", "name": "clang-build-debug-x64" }
      ]
    }
  ]
}
```

They are then used like so:
Configure + Build with GCC: `cmake --workflow --preset gcc-debug-arm64`
Configure + Build with Clang: `cmake --workflow --preset clang-debug-arm64`
Configure + Build with Clang (x64): `cmake --workflow --preset clang-debug-x64`

*Addendum: It should also now be possible to cross-compile from Windows to Unix-likes, and Unix-like to other Unix-like (e.g. Linux -> FreeBSD), however this is untested.*

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