Start CMake modernization scaffold

cmake/PanoPainterVersion.cmake

@@ -0,0 +1,17 @@
+function(pp_add_version_generation target config_name)
+    find_package(Python3 COMPONENTS Interpreter REQUIRED)
+
+    add_custom_command(
+        OUTPUT "${CMAKE_CURRENT_SOURCE_DIR}/src/version.gen.h"
+        COMMAND "${Python3_EXECUTABLE}" "${CMAKE_CURRENT_SOURCE_DIR}/scripts/pre-build.py" "${config_name}"
+        WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
+        DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/scripts/pre-build.py"
+        COMMENT "Generating src/version.gen.h"
+        VERBATIM)
+
+    add_custom_target(pp_generate_version
+        DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/src/version.gen.h")
+
+    add_dependencies(${target} pp_generate_version)
+endfunction()
+