Multievent profiling. JFR v2 compatible output

v2.0

Features

• Profile multiple events together (cpu + alloc + lock)
• HTML 5 Flame Graphs: faster rendering, smaller size
• JFR v2 output format, compatible with FlightRecorder API
• JFR to Flame Graph converter
• Automatically turn profiling on/off at --begin/--end functions
• Time-to-safepoint profiling: --ttsp

Improvements

• Unlimited frame buffer. Removed -b option and 64K stack traces limit
• Additional JFR events: OS, CPU, and JVM information; CPU load
• Record bytecode indices / line numbers
• Native stack traces for Java events
• Improved CLI experience
• Better error handling; an option to log warnings/errors to a dedicated stream
• Reduced the amount of unknown stack traces

Changes

• Removed non-ASL code. No more CDDL license