help function
Prints the help messages
Implementation
void help(List<String> args) {
log('To initialize a single config set, run: flconf init <configname>');
log('To initialize multiple config sets at once, run: flconf init <configname1> <configname2> <configname3> ...');
log('To generate boilerplate dart classes, run: flconf generate');
log('To run/build/drive from config file: flconf <run/build/drive> <configname> <extra flutter parameters>');
exit(0);
}