Get rid of unused wxTransformMatrix

As it is stated in matrix.cpp wxTransformMatrix was intended to be used
in wxDC to replace the basic system of scaling/translation but actually
it was never used.
Because applying affine transformations can be done with wxAffineMatrix2D
and wxDC::SetTransformMatrix() we can get rid of this dead code.

Closes #13114.

build/files

@@ -806,7 +806,6 @@ GUI_CMN_SRC =
     src/common/lboxcmn.cpp
     src/common/listctrlcmn.cpp
     src/common/markupparser.cpp
-    src/common/matrix.cpp
     src/common/menucmn.cpp
     src/common/modalhook.cpp
     src/common/mousemanager.cpp
@@ -1101,7 +1100,6 @@ GUI_CMN_HDR =
     wx/listbook.h
     wx/listbox.h
     wx/listctrl.h
-    wx/matrix.h
     wx/mdi.h
     wx/menu.h
     wx/menuitem.h