Changes v1.2.1

Integral v1.2.1 code can be found in the integral-v1.2.1 branch

Minor changes

• The communityFee is now collected not only from the fee, but also from the pluginFee.

• In order for the plugin to be able to override the fees, the DYNAMIC_FEE flag needs to be set in the pool.

• The plugin can no longer change fee in the pool via setFee() function.