Add ability to export to an external editor within the same folder as the original file - issue 6195 (#6232)

* import and change the art code -thanks to Alberto

* Possible fixed for white space in folder

* Added verbose when white-space

* Replace WS only if windows and Gimp

* Fixed Windows and Gimp bug for external editor - thanks to Lawrence37

* Fix LGTM alert for reused variable name

Co-authored-by: Thanatomanic <6567747+Thanatomanic@users.noreply.github.com>

rtgui/options.h

@@ -280,6 +280,16 @@ public:
     Glib::ustring CPBPath; // Custom Profile Builder's path
     CPBKeyType CPBKeys; // Custom Profile Builder's key type
     int editorToSendTo;
+    enum EditorOutDir {
+        EDITOR_OUT_DIR_TEMP,
+        EDITOR_OUT_DIR_CURRENT,
+        EDITOR_OUT_DIR_CUSTOM
+    };
+    EditorOutDir editor_out_dir; // output directory for "open in external editor"
+    Glib::ustring editor_custom_out_dir;
+    bool editor_float32;
+    bool editor_bypass_output_profile;
+    
     int maxThumbnailHeight;
     int maxThumbnailWidth;
     std::size_t maxCacheEntries;