add self updater (#1352)

* add self updater

* remove updater tests after validation

src/updater/CMakeLists.txt

@@ -0,0 +1,15 @@
+# The installer is copied outside the application before it runs. Keep it free of
+# Qt and application DLL dependencies so it can replace those files on Windows.
+if(MSVC)
+	set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")
+endif()
+add_executable(kyty_updater main.cpp UpdateInstaller.cpp)
+
+if(MSVC)
+	target_compile_options(kyty_updater PRIVATE /EHsc)
+else()
+	target_compile_options(kyty_updater PRIVATE -fexceptions)
+endif()
+if(MINGW)
+	target_link_options(kyty_updater PRIVATE -static -municode)
+endif()