[lldb] Move parts of OutputFormattedUsageText into utility function (#180947) As seen in #177570, this code has a bunch of corner cases, does not handle ANSI codes properly and does not handle unicode at all. That's enough to fix that we need some tests to make it clear where we're starting from. The body of OutputFormattedUsageText is moved into a utility in the AnsiTerminal.h header and tests added to the existing AnsiTerminalTest.cpp. Some results are known to be wrong. Some that cause crashes are commented out, to be enabled once fixed.
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