More vertex attribute work
Move drawables above existing layer rendering.
Use context for the actual draw call.
Fake the vertexes in the shader to get something actually showing up.
Simplify shader state management
* [qt] Updating CMake project files for Qt6
* [qt] Updating non-test projects for Qt6 and msvc2019
* [qt] Test fixes for Qt6 and msvc2019
* [qt] Link whole test archive for Qt and msvc2019
* [qt] Fixing Qt6 headless backend renderer
* [qt] Fixes for test failures
* [qt] Expression and style parser test fixes
* [qt] Backwards compatibility with Qt5 and Qt6
Minimum version is Qt 5.4 due to use of QOpenGLWidget
* [qt] LLVM is no longer required for a Windows build
* [msvc] msvc2019 fixes for maplibre
* Update test/storage/offline_database.test.cpp
Co-authored-by: Tadej Novak <tadej@tano.si>
* Vector + const is not standard C++
Co-authored-by: Tadej Novak <tadej@tano.si>