Update the sample for the 21st century (with just a bit of delay) and
use PNGs under all platforms instead of using BMPs under MSW and XPMs
elsewhere.
Copy PNG icons from Tango, even if we already have almost of them in
art/tango because we plan to also use "2x" versions of them in this
sample soon.
Standardize on using sample.rc and sample icon in all the samples, it was
confusing that some of them used it and other didn't, without any apparent
logic.
Remove the now unnecessary icon files, including the dialogs sample icon which
seemed to be corrupted (this closes#11146).
Also replace multiple OS/2 resource files with a single one in the sample
directory. The OS/2 projects/makefiles would need to be updated to use them.
Remove dialogs sample icon.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@64645 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
