v2.0.0

This major release:

• Changes intermediate format between merge and other tools from JSON to sqlite database. This reduces required storage by half and significantly reduces memory consumption when loading large profiling files @fsimonis in #6
• Improves analyze and-histogram commands to filter events directly in SQL instead of loading them into a dataframe first
• Adds flag -w to directly open the exported trace in perfetto by @fsimonis in #4