// PluginReader is an interface for input plugins
type PluginReader interface {
PluginRead() (msg *Message, err error)
}
// PluginWriter is an interface for output plugins
type PluginWriter interface {
PluginWrite(msg *Message) (n int, err error)
}
All flags that expect buffer as input i.e. `--output-file-size-limit`, `--output-file-max-size-limit`, `--copy-buffer-size` and `input-raw-buffer-size` can now parse inputs from differents bases and data units like: `10mb`, `10kb`, `100gb`, `18tb`, `11839023`....
data units and bases are case insensitive, the parser accepts only the format of [Go integer literals](https://golang.org/ref/spec#Integer_literals)
