Validate passed boards before project initialization
Validate passed boards before project initialization

bkudria/platformio,jrobeson/platformio,jrobeson/platformio,bkudria/platformio,mseroczynski/platformio,eiginn/platformio,atyenoria/platformio,bkudria/platformio,platformio/platformio-core,jrobeson/platformio,dkuku/platformio,platformio/platformio,bkudria/platformio,jrobeson/platformio,mplewis/platformio,valeros/platformio,mcanthony/platformio,platformio/platformio-core,ZachMassia/platformio