Backtrace Unity 2.1.5

This release includes updated library lists and improved packaging.

• Backtrace Unity plugin UI improvements - added tooltips, headers and collapsible menu for advanced options.
• Changed Client-side deduplication menu,
• BacktraceClient now allows you to choose what type of fingerprint Backtrace should generate for reports without stack trace. Use normalized exception message allows you to use a normalized exception message to generate fingerprint, instead of stack trace.
• Added exception source code information to exception and message type of reports.