Add support for CMake 3.21 and CMakePresets.json v3 files

[esweet431]

Kitware is incrementing the version of CMakePresets.json files in CMake 3.21. We need to support CMakePresets.json v3 files and CMake 3.21 in cmake-tools.

[esweet431]

In addition to supporting v3 files, there are also some features we can light up in the extension.

• Respect any specified condition(s) when surfacing presets for selection. If the preset is not enabled then it should not be available for selection. We will continue to support our "hostOS" object (for at least a few releases).
• Provide IntelliSense for installDir and toolchainFile in CMakePresets.json. Add note to description of cacheVariables.CMAKE_INSTALL_PREFIX and cacheVariables.CMAKE_TOOLCHAIN_FILE to use root level objects (installDir and toolchainFile) in cases where the user is using a file with version >= 3.

Edited to not include changes to our templates.

[KUGA2]

CMake 3.21 is now released. Do you have a plan when this will be availible in cmake-tools?
Or at least make the parser less picky.

[anb0s]

We have also switched to CMakePresets.json v3 and wanted to use toolchainFile instead of cacheVariables.CMAKE_TOOLCHAIN_FILE because CMake shows warning during build step. Is there a timeline for release of next plugin version or a beta release? Thanks!

[bobbrow]

@anb0s thanks for asking. You can try a preview of this feature by following these steps:

1. Download the build artifact from here: /~https://github.com/microsoft/vscode-cmake-tools/suites/3758389143/artifacts/92322935
2. Unzip the VSIX file
3. Run the Install from VSIX... command and select the VSIX file.

Let us know if you have any issues with it.

[anb0s]

verified with 1.9.0 - the v3 is supported

[anb0s]

have other issue now, see #2179