build: minor refactoring and fixes

- Fix target_precompile_headers() usage; the CemuCommon target exposes
  the src/Common/precompiled.h precompiled header as part of its public
  interface with
  target_precompile_headers(CemuCommon PUBLIC precompiled.h), so all the
  other targets wanting to use the precompiled header have to link to
  the CemuCommon target with
  target_precompile_headers(TargetName PRIVATE CemuCommon).
- Set the project version to 2.0
- Set RUNTIME_OUTPUT_DIRECTORY instead of only their _DEBUG and _RELEASE
  variants, fixing the compilation when neither build types are defined
- Use a consistent indentation style (tabs, like in the .cpp files)
- Use "modern" variants of some functions, e.g. add_definitions ->
  add_compile_definitions

src/audio/CMakeLists.txt

@@ -1,42 +1,46 @@
 project(CemuAudio)
 
 add_library(CemuAudio
-IAudioAPI.cpp
-IAudioAPI.h
+	IAudioAPI.cpp
+	IAudioAPI.h
 )
 
 set_property(TARGET CemuAudio PROPERTY MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")
 
 # move these to UI folder
 target_sources(CemuAudio PRIVATE
-  audioDebuggerWindow.cpp
-  audioDebuggerWindow.h
+	audioDebuggerWindow.cpp
+	audioDebuggerWindow.h
 )
 
 if(WIN32)
-  target_sources(CemuAudio PRIVATE
-      DirectSoundAPI.cpp
-      DirectSoundAPI.h
-      XAudio2API.cpp
-      XAudio2API.h
-      XAudio27API.cpp
-      XAudio27API.h
-  )
+	target_sources(CemuAudio PRIVATE
+		DirectSoundAPI.cpp
+		DirectSoundAPI.h
+		XAudio2API.cpp
+		XAudio2API.h
+		XAudio27API.cpp
+		XAudio27API.h
+	)
 endif()
 
 if(ENABLE_CUBEB)
-  target_sources(CemuAudio PRIVATE
-          CubebAPI.cpp
-          CubebAPI.h
-  )
-  #add_definitions(HAS_CUBEB)
+	target_sources(CemuAudio PRIVATE
+		CubebAPI.cpp
+		CubebAPI.h
+	)
+	#add_compile_definitions(HAS_CUBEB)
 endif()
 
-target_precompile_headers(CemuAudio PRIVATE ../Common/precompiled.h)
-
 target_include_directories(CemuAudio PUBLIC "../")
 
-target_link_libraries(CemuAudio PRIVATE CemuCafe CemuConfig CemuGui CemuUtil)
+target_link_libraries(CemuAudio PRIVATE
+	CemuCafe
+	CemuCommon
+	CemuConfig
+	CemuGui
+	CemuUtil
+)
 
 if(ENABLE_CUBEB)
 	# PUBLIC because cubeb.h/cubeb.h is included in CubebAPI.h