Fix lots of warnings reported by Clang.

Mostly potentially lossy implicit conversions in headers (long->int). Also dangling else warnings. Struct/class mismatches.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74473 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/graphics.h

@@ -981,7 +981,7 @@ public:
     /**
         Returns the number of stops.
     */
-    unsigned GetCount() const;
+    size_t GetCount() const;
 
     /**
         Set the start colour to @a col

interface/wx/statusbr.h

@@ -39,7 +39,7 @@ public:
     /**
         Constructs the pane with the given @a style and @a width.
     */
-    wxStatusBarPane(int style = wxSB_NORMAL, size_t width = 0);
+    wxStatusBarPane(int style = wxSB_NORMAL, int width = 0);
 
     /**
         Returns the pane width; it maybe negative, indicating a variable-width field.