Start CMake modernization scaffold

tests/CMakeLists.txt

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+add_library(pp_test_harness INTERFACE)
+target_include_directories(pp_test_harness INTERFACE
+    "${CMAKE_CURRENT_SOURCE_DIR}")
+target_link_libraries(pp_test_harness INTERFACE
+    pp_project_options
+    pp_project_warnings)
+
+add_executable(pp_foundation_tests
+    foundation/binary_stream_tests.cpp)
+target_link_libraries(pp_foundation_tests PRIVATE
+    pp_foundation
+    pp_test_harness)
+
+add_test(NAME pp_foundation_tests COMMAND pp_foundation_tests)
+set_tests_properties(pp_foundation_tests PROPERTIES
+    LABELS "foundation;desktop-fast")
+
+if(TARGET pano_cli)
+    add_test(NAME pano_cli_create_document_smoke
+        COMMAND pano_cli create-document --width 64 --height 32 --layers 2)
+    set_tests_properties(pano_cli_create_document_smoke PROPERTIES
+        LABELS "integration;desktop-fast")
+endif()