Generate version header when configuring project

The basic idea is we create a version header template at
"src/base/version.h.in" and the build systems are expected to replace
strings that are enclosed with @ symbols and generate
"src/base/version.h" for other source files to consume/include.

src/webui/api/appcontroller.cpp

@@ -57,6 +57,7 @@
 #include "base/utils/net.h"
 #include "base/utils/password.h"
 #include "base/utils/string.h"
+#include "base/version.h"
 #include "../webapplication.h"
 
 void AppController::webapiVersionAction()