Adding the plus handler for string concatenation on VM
Adding the plus handler for string concatenation on VM

clever-lang/clever,clever-lang/clever,felipensp/clever,clever-lang/clever,clever-lang/clever,clever-lang/clever,clever-lang/clever,felipensp/clever,clever-lang/clever,felipensp/clever,felipensp/clever,felipensp/clever,felipensp/clever,felipensp/clever