Implement new indicators CrossOver, CrossAny, CrossDir

[femtotrader]

Expected Behavior

CrossOver, CrossAny, CrossDir might be interesting (and quite simple) indicators to implement.

Tulip indicators provides CrossOver (see doc), CrossAny (see doc)

and CrossDir have been discussed https://github.com/TulipCharts/tulipindicators/issues/103 and implemented in this unmerged PR https://github.com/TulipCharts/tulipindicators/pull/110

Actual Behavior

Currently user have to do this kind of calculation itself

Potential Solution

Reproducing the Problem

System Information

Checklist

• I have completely filled out this template
• I have confirmed that this issue exists on the current master branch
• I have confirmed that this is not a duplicate issue by searching issues

• I have provided detailed steps to reproduce the issue

Any opinion about such "indicators"?
Maybe they have more interrest for vector backtesting?