UIEXT-3570: Add examples framework#203

PaulBrnrther wants to merge 2 commits intomasterknime/knime-core-ui:masterfrom

todo/UIEXT-3570-lay-out-document-by-example-frameworkknime/knime-core-ui:todo/UIEXT-3570-lay-out-document-by-example-frameworkCopy head branch name to clipboard