Move wx/display_impl.h to wx/private/display.h

This shows more clearly that this header is private to wxWidgets and
can't be included by user code.

No real changes.

build/bakefiles/files.bkl

@@ -1124,7 +1124,6 @@ IMPORTANT: please read docs/tech/tn0016.txt before modifying this file!
     wx/dialup.h
     wx/dirctrl.h
     wx/display.h
-    wx/display_impl.h
     wx/dnd.h
     wx/docmdi.h
     wx/docview.h

build/cmake/files.cmake

@@ -1032,7 +1032,6 @@ set(GUI_CMN_HDR
     wx/dialup.h
     wx/dirctrl.h
     wx/display.h
-    wx/display_impl.h
     wx/dnd.h
     wx/docmdi.h
     wx/docview.h

build/files

@@ -967,7 +967,6 @@ GUI_CMN_HDR =
     wx/dirctrl.h
     wx/dirdlg.h
     wx/display.h
-    wx/display_impl.h
     wx/dnd.h
     wx/docmdi.h
     wx/docview.h

build/msw/wx_core.vcxproj

@@ -1280,7 +1280,6 @@
     <ClInclude Include="..\..\include\wx\dirctrl.h" />
     <ClInclude Include="..\..\include\wx\dirdlg.h" />
     <ClInclude Include="..\..\include\wx\display.h" />
-    <ClInclude Include="..\..\include\wx\display_impl.h" />
     <ClInclude Include="..\..\include\wx\dnd.h" />
     <ClInclude Include="..\..\include\wx\docmdi.h" />
     <ClInclude Include="..\..\include\wx\docview.h" />

build/msw/wx_core.vcxproj.filters

@@ -1267,9 +1267,6 @@
     <ClInclude Include="..\..\include\wx\display.h">
       <Filter>Common Headers</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\include\wx\display_impl.h">
-      <Filter>Common Headers</Filter>
-    </ClInclude>
     <ClInclude Include="..\..\include\wx\dnd.h">
       <Filter>Common Headers</Filter>
     </ClInclude>

build/msw/wx_vc7_core.vcproj

@@ -2270,9 +2270,6 @@
 			<File
 				RelativePath="..\..\include\wx\display.h">
 			</File>
-			<File
-				RelativePath="..\..\include\wx\display_impl.h">
-			</File>
 			<File
 				RelativePath="..\..\include\wx\dnd.h">
 			</File>

build/msw/wx_vc8_core.vcproj

@@ -3528,10 +3528,6 @@
 				RelativePath="..\..\include\wx\display.h"
 				>
 			</File>
-			<File
-				RelativePath="..\..\include\wx\display_impl.h"
-				>
-			</File>
 			<File
 				RelativePath="..\..\include\wx\dnd.h"
 				>

build/msw/wx_vc9_core.vcproj

@@ -3524,10 +3524,6 @@
 				RelativePath="..\..\include\wx\display.h"
 				>
 			</File>
-			<File
-				RelativePath="..\..\include\wx\display_impl.h"
-				>
-			</File>
 			<File
 				RelativePath="..\..\include\wx\dnd.h"
 				>