Configuration update application at startup

xs/src/slic3r/Utils/Semver.hpp

@@ -11,7 +11,6 @@
 
 namespace Slic3r {
 
-// FIXME:: operators=: leak, return
 
 class Semver
 {
@@ -20,6 +19,8 @@ public:
 	struct Minor { const int i;  Minor(int i) : i(i) {} };
 	struct Patch { const int i;  Patch(int i) : i(i) {} };
 
+	Semver() : ver(semver_zero()) {}
+
 	Semver(int major, int minor, int patch,
 		boost::optional<std::string> metadata = boost::none,
 		boost::optional<std::string> prerelease = boost::none)