Fixed various memory leaks as reported by AddressSanitizer

rtengine/camconst.cc

@@ -27,9 +27,6 @@ CameraConst::CameraConst()
     white_max = 0;
 }
 
-CameraConst::~CameraConst()
-{
-}
 
 bool
 CameraConst::parseApertureScaling(CameraConst *cc, void *ji_)
@@ -709,6 +706,14 @@ CameraConstantsStore::CameraConstantsStore()
 {
 }
 
+
+CameraConstantsStore::~CameraConstantsStore()
+{
+    for (auto &p : mCameraConstants) {
+        delete p.second;
+    }
+}
+
 void CameraConstantsStore::init(Glib::ustring baseDir, Glib::ustring userSettingsDir)
 {
     parse_camera_constants_file(Glib::build_filename(baseDir, "camconst.json"));