WICKET-3335 Try to make the nested borders test working (no success)
WICKET-3335 Test with inner panels (ignored, not working)
WICKET-3335 extract panels' and borders' markup in files

MarkupContainer#getAssociatedMarkup() returns wrong markup when using StringResourceStream
Add licence headers
WICKET-3335 Add impl of ComponentQueue based on HashMap

MiniMap is not hash based so it won't gain CPU performance over ComponentQueue