Merge branch 'bitmap-bundle'

Add wxBitmapBundle and use it in wxToolBar.

See https://github.com/wxWidgets/wxWidgets/pull/2535

build/cmake/files.cmake

@@ -918,6 +918,8 @@ set(GUI_CMN_SRC
     src/generic/creddlgg.cpp
     src/generic/rowheightcache.cpp
     src/generic/animateg.cpp
+    src/common/bmpbndl.cpp
+    src/generic/bmpsvg.cpp
 )
 
 set(GUI_CMN_HDR
@@ -1209,6 +1211,7 @@ set(GUI_CMN_HDR
     wx/creddlg.h
     wx/generic/creddlgg.h
     wx/generic/animate.h
+    wx/bmpbndl.h
 )
 
 set(UNIX_SRC
@@ -1961,6 +1964,7 @@ set(MSW_LOWLEVEL_SRC
     src/msw/richtooltip.cpp
     src/msw/evtloop.cpp
     src/msw/ole/access.cpp
+    src/msw/bmpbndl.cpp
 )
 
 set(MSW_LOWLEVEL_HDR
@@ -2298,6 +2302,7 @@ set(OSX_LOWLEVEL_SRC
     src/osx/core/timer.cpp
     src/osx/core/utilsexc_cf.cpp
     #TODO:     </if>
+    src/osx/core/bmpbndl.mm
 )
 
 set(OSX_LOWLEVEL_HDR