- Some tools, such as Support Assistant, provide extra reports directly from tests
using a window._$files variable; this is no longer read anywhere and such reports are
currently unsupported
- See https://github.com/SAP/openui5/blob/master/src/sap.ui.core/src/sap/ui/core/support/RuleEngineOpaExtension.js#L243
- this adds mechanism to read and save these the variable as files using a custom reporter
with some additions to browser.js to 'send' the results as part of karma.complete argument

Improve mechanism of writing files to prevent
overwriting of existing files.