Improve config validation

[4TT1L4]

Problem:

• At the moment the error messages printed when the configuration is not valid is not really good.

When the configuration is not valid, things like the following error are logged:

geniusyield-market-maker-exe: user error (Error in $: object value > ',' or '}': Failed reading: satisfy)

This is not really helpful. Please make sure to print error messages that help to identify the issue. As a bare minimum: add some validation and log the name of the invalid config setting.