Add version.{h,cpp}: Returning version info

qswiki.cpp

@@ -41,6 +41,7 @@ SOFTWARE.
 #include "cli.h"
 #include "cliconsole.h"
 #include "cliserver.h"
+#include "version.h"
 
 void sigterm_handler(int arg)
 {
@@ -73,11 +74,6 @@ std::unique_ptr<ICache> createCache(const ConfigVariableResolver &resolver)
 	return std::make_unique<FsCache>(path);
 }
 
-std::string get_version_string()
-{
-	return "master";
-}
-
 int main(int argc, char **argv)
 {