Improve replay performance

[abitmore]

It now need about 3 hours to replay the chain.

Update: profiling data: https://pastebin.com/abmzjruy

Sub-tasks:

• Improve vote tally performance #803 improve vote tally performance (short term)
• Improve vote tally performance (long term) #1204 improve vote tally performance (long term)
• Improve adjust_balance performance #1083 improve adjust_balance performance
• Improve performance of database::update_expired_feeds() #1093 improve update_expired_feeds performance
• Improve price comparison performance #1094 improve price comparison performance
• Replace/rewrite fc::uint128 with boost::multiprecision for better performance #1660 replace/rewrite fc::uint128 with boost::multiprecision