Fixed various typos.

Applied patch by snowleopard2 fixing a bunch of typos such as misspellings and double words in the documentation. Combined the patch with some local queued typos waiting to be committed as well as adding new typo fixes inspired by the patch.

Function names with American spelling were not changed nor was third-party code touched. The only code changes involve some changes in strings that are translated ("Can not" -> "Cannot").

Closes #13063 (again).

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67280 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/app.cpp

@@ -86,7 +86,7 @@ static void wx_add_idle_hooks()
         }
     }
     // "size_allocate" hook
-    // Needed to match the behavior of the old idle system,
+    // Needed to match the behaviour of the old idle system,
     // but probably not necessary.
     {
         static bool hook_installed;
@@ -125,7 +125,7 @@ bool wxApp::DoIdle()
 
 #if wxDEBUG_LEVEL
         // don't generate the idle events while the assert modal dialog is shown,
-        // this matches the behavior of wxMSW
+        // this matches the behaviour of wxMSW
         if (m_isInAssert)
             return false;
 #endif
@@ -439,7 +439,7 @@ bool wxApp::Initialize(int& argc_, wxChar **argv_)
         return false;
     }
 
-    // we can not enter threads before gtk_init is done
+    // we cannot enter threads before gtk_init is done
     gdk_threads_enter();
 
 #if wxUSE_INTL