Initial CMake build support

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.15)
+
+project(SquidTasks)
+
+add_library(${PROJECT_NAME} INTERFACE)
+
+# There doesn't seem to be a coroutines feature in CMAKE_CXX_KNOWN_FEATURES
+
+# Some errors in Sample_TextGame with std_20
+#target_compile_features(${PROJECT_NAME} INTERFACE "cxx_std_20")
+
+if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
+  target_compile_options(${PROJECT_NAME} INTERFACE "-fcoroutines-ts")
+elseif(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
+  if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 16.10)
+    # Seems like we should use /await:strict here, but seems to fail.
+    #target_compile_options(${PROJECT_NAME} INTERFACE "/await:strict")
+    target_compile_options(${PROJECT_NAME} INTERFACE "/await")
+  else()
+    target_compile_options(${PROJECT_NAME} INTERFACE "/await")
+  endif()
+endif()
+
+target_include_directories(${PROJECT_NAME} INTERFACE include)
+
+target_sources(${PROJECT_NAME} INTERFACE
+  include/Task.h
+  include/TaskManager.h
+  include/TasksConfig.h
+  include/TokenList.h
+  include/TaskFSM.h
+  include/FunctionGuard.h
+  # Private
+  include/Private/TaskPrivate.h
+  include/Private/TaskFSMPrivate.h
+  include/Private/TasksCommonPrivate.h
+  include/Private/tl/optional.hpp
+  )
+
+option(SQUIDTASKS_BUILD_SAMPLES "Enable building with samples." OFF)
+
+if(SQUIDTASKS_BUILD_SAMPLES)
+  add_subdirectory(samples/Sample_Tests)
+  add_subdirectory(samples/Sample_Template)
+  add_subdirectory(samples/Sample_TextGame)
+endif()

samples/Sample_Template/CMakeLists.txt

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+add_executable(Sample_Template)
+
+target_link_libraries(Sample_Template SquidTasks)
+
+target_include_directories(Sample_Template PRIVATE ../Common)
+
+target_sources(Sample_Template PRIVATE
+  ../Common/TimeSystem.h
+   Main.cpp
+)

samples/Sample_Tests/CMakeLists.txt

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+add_executable(Sample_Tests)
+
+target_link_libraries(Sample_Tests SquidTasks)
+
+target_include_directories(Sample_Tests PRIVATE ../Common)
+
+target_sources(Sample_Tests PRIVATE
+  ../Common/TimeSystem.h
+   Main.cpp
+)

samples/Sample_TextGame/CMakeLists.txt

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+add_executable(Sample_TextGame)
+
+target_link_libraries(Sample_TextGame SquidTasks)
+
+target_include_directories(Sample_TextGame PRIVATE ../Common)
+
+target_sources(Sample_TextGame PRIVATE
+  ../Common/TimeSystem.h
+  TextGame.h
+  TextInput.h
+  Main.cpp
+)