Replace wxTreeItemAttr and wxListItemAttr with wxItemAttr

The two existing structs were completely identical, just replace them with a
single wxItemAttr.

Notice that wxDataViewItemAttr is not quite the same, although pretty similar,
so it remains separate for now. It would be nice to combine it with this one
too in the future, e.g. to make it simpler to make items bold in a wxListCtrl.

build/bakefiles/files.bkl

@@ -1181,6 +1181,7 @@ IMPORTANT: please read docs/tech/tn0016.txt before modifying this file!
     wx/systhemectrl.h
     wx/collheaderctrl.h
     wx/generic/collheaderctrl.h
+    wx/itemattr.h
 </set>
 
 <!-- ====================================================================== -->

build/files

@@ -1039,6 +1039,7 @@ GUI_CMN_HDR =
     wx/imagtga.h
     wx/imagtiff.h
     wx/imagxpm.h
+    wx/itemattr.h
     wx/listbase.h
     wx/listbook.h
     wx/listctrl.h

build/msw/wx_core.vcxproj

@@ -1379,6 +1379,7 @@
     <ClInclude Include="..\..\include\wx\collheaderctrl.h" />
     <ClInclude Include="..\..\include\wx\generic\collheaderctrl.h" />
     <ClInclude Include="..\..\include\wx\msw\rt\utils.h" />
+    <ClInclude Include="..\..\include\wx\itemattr.h" />
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">

build/msw/wx_core.vcxproj.filters

@@ -690,6 +690,9 @@
     <ClCompile Include="..\..\src\msw\graphics.cpp">
       <Filter>MSW Sources</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\src\msw\graphicsd2d.cpp">
+      <Filter>MSW Sources</Filter>
+    </ClCompile>
     <ClCompile Include="..\..\src\msw\headerctrl.cpp">
       <Filter>MSW Sources</Filter>
     </ClCompile>
@@ -897,9 +900,6 @@
     <ClCompile Include="..\..\src\xrc\xmlreshandler.cpp">
       <Filter>Common Sources</Filter>
     </ClCompile>
-    <ClCompile Include="..\..\src\msw\graphicsd2d.cpp">
-      <Filter>MSW Sources</Filter>
-    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ResourceCompile Include="..\..\src\msw\version.rc">
@@ -928,6 +928,9 @@
     <ClInclude Include="..\..\include\wx\anybutton.h">
       <Filter>Common Headers</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\include\wx\appprogress.h">
+      <Filter>Common Headers</Filter>
+    </ClInclude>
     <ClInclude Include="..\..\include\wx\artprov.h">
       <Filter>Common Headers</Filter>
     </ClInclude>
@@ -1312,6 +1315,9 @@
     <ClInclude Include="..\..\include\wx\infobar.h">
       <Filter>Common Headers</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\include\wx\itemattr.h">
+      <Filter>Common Headers</Filter>
+    </ClInclude>
     <ClInclude Include="..\..\include\wx\itemid.h">
       <Filter>Common Headers</Filter>
     </ClInclude>
@@ -1672,9 +1678,6 @@
     <ClInclude Include="..\..\include\wx\msw\window.h">
       <Filter>MSW Headers</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\include\wx\appprogress.h">
-      <Filter>Common Headers</Filter>
-    </ClInclude>
     <ClInclude Include="..\..\include\wx\nativewin.h">
       <Filter>Common Headers</Filter>
     </ClInclude>

build/msw/wx_vc7_core.vcproj

@@ -2285,6 +2285,9 @@
 			<File
 				RelativePath="..\..\include\wx\infobar.h">
 			</File>
+			<File
+				RelativePath="..\..\include\wx\itemattr.h">
+			</File>
 			<File
 				RelativePath="..\..\include\wx\itemid.h">
 			</File>

build/msw/wx_vc8_core.vcproj

@@ -3548,6 +3548,10 @@
 				RelativePath="..\..\include\wx\infobar.h"
 				>
 			</File>
+			<File
+				RelativePath="..\..\include\wx\itemattr.h"
+				>
+			</File>
 			<File
 				RelativePath="..\..\include\wx\itemid.h"
 				>

build/msw/wx_vc9_core.vcproj

@@ -3544,6 +3544,10 @@
 				RelativePath="..\..\include\wx\infobar.h"
 				>
 			</File>
+			<File
+				RelativePath="..\..\include\wx\itemattr.h"
+				>
+			</File>
 			<File
 				RelativePath="..\..\include\wx\itemid.h"
 				>