Update the minimum required CMake version in more places

Co-authored-by: Steve Lhomme <robux4@ycbcr.xyz>

README.md

@@ -35,7 +35,7 @@ For further help getting started, please refer to the JUCE
 
 ### CMake
 
-Version 3.15 or higher is required. To use CMake, you will need to install it,
+Version 3.22 or higher is required. To use CMake, you will need to install it,
 either from your system package manager or from the [official download
 page](https://cmake.org/download/). For comprehensive documentation on JUCE's
 CMake API, see the [JUCE CMake documentation](/docs/CMake%20API.md). For

docs/CMake API.md

@@ -2,7 +2,7 @@
 
 ## System Requirements
 
-- All project types require CMake 3.15 or higher.
+- All project types require CMake 3.22 or higher.
 - Android targets are not currently supported.
 - WebView2 on Windows via JUCE_USE_WIN_WEBVIEW2 flag in juce_gui_extra is not currently supported.
 
@@ -144,11 +144,10 @@ you can configure a Clang-cl build by passing "-T ClangCL" on your configuration
 If you wish to use Clang with GNU-like command-line instead, you can pass
 `-DCMAKE_CXX_COMPILER=clang++` and `-DCMAKE_C_COMPILER=clang` on your configuration commandline.
 clang++ and clang must be on your `PATH` for this to work. Only more recent versions of CMake
-support Clang's GNU-like command-line on Windows. CMake 3.12 is not supported, CMake 3.15 has
-support, CMake 3.20 or higher is recommended.  Note that CMake doesn't seem to automatically link a
-runtime library when building in this configuration, but this can be remedied by setting the
-`MSVC_RUNTIME_LIBRARY` property. See the [official
-documentation](https://cmake.org/cmake/help/v3.15/prop_tgt/MSVC_RUNTIME_LIBRARY.html) of this
+support Clang's GNU-like command-line on Windows.   Note that CMake doesn't seem to automatically
+link a runtime library when building in this configuration, but this can be remedied by setting
+the `MSVC_RUNTIME_LIBRARY` property. See the [official
+documentation](https://cmake.org/cmake/help/v3.22/prop_tgt/MSVC_RUNTIME_LIBRARY.html) of this
 property for usage recommendations.
 
 ### A note about compile definitions

examples/CMake/AudioPlugin/CMakeLists.txt

@@ -8,7 +8,7 @@
 # CMake's behaviour is compatible with the named version. This is a standard CMake command, so more
 # information can be found in the CMake docs.
 
-cmake_minimum_required(VERSION 3.15)
+cmake_minimum_required(VERSION 3.22)
 
 # The top-level CMakeLists.txt file for a project must contain a literal, direct call to the
 # `project()` command. `project()` sets up some helpful variables that describe source/binary

examples/CMake/ConsoleApp/CMakeLists.txt

@@ -10,7 +10,7 @@
 # CMake's behaviour is compatible with the named version. This is a standard CMake command, so more
 # information can be found in the CMake docs.
 
-cmake_minimum_required(VERSION 3.15)
+cmake_minimum_required(VERSION 3.22)
 
 # The top-level CMakeLists.txt file for a project must contain a literal, direct call to the
 # `project()` command. `project()` sets up some helpful variables that describe source/binary

examples/CMake/GuiApp/CMakeLists.txt

@@ -9,7 +9,7 @@
 # CMake's behaviour is compatible with the named version. This is a standard CMake command, so more
 # information can be found in the CMake docs.
 
-cmake_minimum_required(VERSION 3.15)
+cmake_minimum_required(VERSION 3.22)
 
 # The top-level CMakeLists.txt file for a project must contain a literal, direct call to the
 # `project()` command. `project()` sets up some helpful variables that describe source/binary