Feature/integrated touchserver (#1015)

* WINDOWS: Touch server integrated into module

The touch server functionality has been integrated into the touch module
which is enabled by-default when the touch module is used on a windows
build.
The touch-hook checks for a connected digitizer (pen or touchscreen, but
I haven't tested pen)

This commit should also fix two potential low-risk race conditions in
the tuioear.cpp file.

* Added comment regarding which window we use

* Added copyright notice on the win32_touch files

Also changed from #pragma to #ifndef

* Fixes based on review

- Added anonymous namespace
- Put win32hook in openspace namespace
- Fixed indentations and linebreaks
- Fixed an issue regarding global state deinitialization

apps/OpenSpace/main.cpp

@@ -1042,6 +1042,16 @@ void setSgctDelegateFunctions() {
         sgct::SGCTWindow* w = sgct::Engine::instance()->getWindowPtr(0);
         w->setHorizFieldOfView(hFovDeg);
     };
+    #ifdef WIN32
+    sgctDelegate.getNativeWindowHandle = [](size_t windowIndex) -> void* {
+        sgct::SGCTWindow* w = sgct::Engine::instance()->getWindowPtr(windowIndex);
+        if(w) {
+                HWND hWnd = glfwGetWin32Window(w->getWindowHandle());
+                return reinterpret_cast<void*>(hWnd);
+        }
+        return nullptr;
+    };
+    #endif // WIN32
     sgctDelegate.frustumMode = []() {
         using FM = sgct_core::Frustum::FrustumMode;
         switch (sgct::Engine::instance()->getCurrentFrustumMode()) {