use gradle.properties to set group

[MicrocontrollersDev]

right now, the group field is buried in the middle of the b.g.kts and is something i always forget to change. this should be moved to the gradle.properties file like all the other project specific variables are

[pauliesnug]

right now, the group field is buried in the middle of the b.g.kts and is something i always forget to change. this should be moved to the gradle.properties file like all the other project specific variables are

@MicrocontrollersDev The entire template will be reworked once OneConfig/v1 releases.