Access PerformanceAnalyzer Statistics in Plugins

[askmike]

Very good question, the result of the PerformanceAnalyser is actually hidden for other plugins. However I am in the process of changing that: I will use proper events for everything, as well as add a few plugins that log some stuff (like trades, profit reports) to CSV.

There is a PR open where I am working on this, will take a while because it requires a lot of changes. Here is the PR: https://github.com/askmike/gekko/pull/1850