Support wasm components installation (#55)

* Support for WebAssembler

- Qt 5.12 provide tech preview for wasm, and 5.13 and later it supports.

Signed-off-by: Hiroshi Miura <miurahr@linux.com>

tests/helloworld/main.cpp

@@ -0,0 +1,12 @@
+#include <QApplication>
+#include <QPushButton>
+
+int main(int argc, char **argv)
+{
+ QApplication app (argc, argv);
+
+ QPushButton button ("Hello world !");
+ button.show();
+
+ return app.exec();
+}