A few more minor fixes geared towards lgtm.com alerts (#6127)

* Remove unfilled formatting placeholders in KLT parser.
* Fix presumably unintentionally missing reference on PlanatPtr and ChunkyPtr call operators.
* Fix catching pointer and make use-after-free of workimg easier to spot.
Make sure all of our thrown exceptions derive from std::exception and then catch
by reference instead of by pointer.
* Fix mismatch between array form new and non-array form delete.
* Simplify memory management of embedded color profiles by unifying allocation to use operator new.

rtengine/improcfun.cc

@@ -5622,14 +5622,8 @@ double ImProcFunctions::getAutoDistor(const Glib::ustring &fname, int thumb_size
         rawGray = raw->getGrayscaleHistEQ(width);
 
         if (!thumbGray || !rawGray) {
-            if (thumbGray) {
-                delete thumbGray;
-            }
-
-            if (rawGray) {
-                delete rawGray;
-            }
-
+            delete[] thumbGray;
+            delete[] rawGray;
             delete thumb;
             delete raw;
             return 0.0;
@@ -5642,8 +5636,8 @@ double ImProcFunctions::getAutoDistor(const Glib::ustring &fname, int thumb_size
             calcDistortion(thumbGray, rawGray, width, h_thumb, 4, dist_amount);
         }
 
-        delete thumbGray;
-        delete rawGray;
+        delete[] thumbGray;
+        delete[] rawGray;
         delete thumb;
         delete raw;
         return dist_amount;