chore(CI): add Qt 6 build, other minor updates

.github/workflows/macos.yml

@@ -8,9 +8,9 @@ jobs:
     runs-on: macos-latest
 
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v3
     - name: Install Qt
-      uses: jurplel/install-qt-action@v2
+      uses: jurplel/install-qt-action@v3
       with:
         version: '5.15.2'
     - name: Run a qt project

.github/workflows/windows.yml

@@ -15,7 +15,7 @@ jobs:
     steps:
     - uses: actions/checkout@v3
     - name: Install Qt
-      uses: jurplel/install-qt-action@v2
+      uses: jurplel/install-qt-action@v3
       with:
         arch: 'win64_msvc2019_64'
         version: '5.15.2'

appveyor.yml

@@ -1,5 +1,5 @@
 image:
-  - Visual Studio 2019
+  - Visual Studio 2022
 environment:
   CMAKE_INSTALL_PREFIX: C:\projects\cmake
   LIBZ: C:\projects\zlib
@@ -8,9 +8,18 @@ environment:
   LIBEXIV2: C:\projects\exiv2
   PPKG: C:\projects\ppkg
   matrix:
-    - build_name: mingw81_64_qt5_15_2
+    - job_name: mingw_64_qt6_4
+      QTDIR: C:\Qt\6.4\mingw_64
+      MINGW64: C:\Qt\Tools\mingw1120_64
+      KF_BRANCH: master
+      PPIC_CMAKE_OPTIONS: "-DPREFER_QT_5=OFF"
+      WINDEPLOYQT_ARGS: "--verbose=2 --no-quick-import --no-translations --no-opengl-sw --no-system-d3d-compiler"
+    - job_name: mingw81_64_qt5_15_2
       QTDIR: C:\Qt\5.15.2\mingw81_64
       MINGW64: C:\Qt\Tools\mingw810_64
+      KF_BRANCH: kf5
+      PPIC_CMAKE_OPTIONS: ""
+      WINDEPLOYQT_ARGS: "--verbose=2 --no-quick-import --no-translations --no-opengl-sw --no-angle --no-system-d3d-compiler"
 
 install:
   - mkdir %CMAKE_INSTALL_PREFIX%
@@ -45,7 +54,7 @@ build_script:
   - cd %APPVEYOR_BUILD_FOLDER%
 # install ECM so we can build KImageFormats
   - cd 3rdparty
-  - git clone -b kf5 -q https://invent.kde.org/frameworks/extra-cmake-modules.git
+  - git clone -b %KF_BRANCH% -q https://invent.kde.org/frameworks/extra-cmake-modules.git
   - git rev-parse HEAD
   - cd extra-cmake-modules
   - cmake -G "Ninja" . -DCMAKE_INSTALL_PREFIX=%CMAKE_INSTALL_PREFIX% -DBUILD_TESTING=OFF
@@ -80,7 +89,7 @@ build_script:
   - cd %APPVEYOR_BUILD_FOLDER%
 # install KArchive for kra format support of KImageFormats
   - cd 3rdparty
-  - git clone -b kf5 -q https://invent.kde.org/frameworks/karchive.git
+  - git clone -b %KF_BRANCH% -q https://invent.kde.org/frameworks/karchive.git
   - git rev-parse HEAD
   - cd karchive
   - mkdir build
@@ -107,7 +116,7 @@ build_script:
   - cd %APPVEYOR_BUILD_FOLDER%
 # install KImageFormats
   - cd 3rdparty
-  - git clone -b kf5 -q https://invent.kde.org/frameworks/kimageformats.git
+  - git clone -b %KF_BRANCH% -q https://invent.kde.org/frameworks/kimageformats.git
   - git rev-parse HEAD
   - cd kimageformats
   - mkdir build
@@ -119,19 +128,19 @@ build_script:
 # finally...
   - mkdir build
   - cd build
-  - cmake .. -G "Unix Makefiles" -DCMAKE_BUILD_TYPE=Release -DCMAKE_MAKE_PROGRAM=mingw32-make -DCMAKE_INSTALL_PREFIX='%cd%'
+  - cmake .. -G "Unix Makefiles" %PPIC_CMAKE_OPTIONS% -DCMAKE_BUILD_TYPE=Release -DCMAKE_MAKE_PROGRAM=mingw32-make -DCMAKE_INSTALL_PREFIX='%cd%'
   - cmake --build . --config Release
   - cmake --build . --config Release --target install/strip
 # fixme: I don't know how to NOT make the binary installed to the ./bin/ folder...
   - cd bin
-  - copy %APPVEYOR_BUILD_FOLDER%\LICENSE .
+  - copy %APPVEYOR_BUILD_FOLDER%\LICENSE
   - copy %CMAKE_INSTALL_PREFIX%\bin\libaom.dll
   - copy %CMAKE_INSTALL_PREFIX%\bin\libexpat-1.dll
   - copy %CMAKE_INSTALL_PREFIX%\bin\libexiv2.dll
   - copy %CMAKE_INSTALL_PREFIX%\bin\libavif.dll
   - copy %CMAKE_INSTALL_PREFIX%\bin\libzlib.dll
-  - copy C:\projects\cmake\bin\libKF5Archive.dll .
+  - copy %CMAKE_INSTALL_PREFIX%\bin\libKF?Archive.dll
-  - windeployqt --verbose=2 --no-quick-import --no-translations --no-opengl-sw --no-angle --no-system-d3d-compiler .\ppic.exe
+  - windeployqt %WINDEPLOYQT_ARGS% .\ppic.exe
 # copy 3rdparty licenses for the libs we vendored for windows...
   - mkdir licenses
   - cd licenses