vcl: add BitmapEx load from icon theme constructor.

Change-Id: I3dbad69664b7417928a6be10ac561307dd94f67b
vcl: calm a valgrind warning.

Change-Id: I12dad502960dc892adce5ab25c8b71f41227198f
vcldemo: load and render some icons

Change-Id: I4a4567d43e4c5c8a7ce7ba2764d2f9668fed291f