SET_META is used to set meta data for a specific stream.

== Data Structure ==
=== Version 0 ===
||= Offset =||= Size/Type  =||= Meaning                                            =||
||0         ||uint8         ||Version (Always zero)                                 ||
||1         ||uint8         ||Update Mode                                           ||
||2         ||uint8         ||Metadata type, see [[Specs/MetaValues]]               ||
||3         ||uint8         ||Length of Key with a maximum of 32                    ||
||4         ||uint8         ||Length of Value                                       ||
||5         ||string        ||Key name                                              ||
||...       ||string        ||Value                                                 ||

==== Update Mode ====
||= Name  =||= ID =||= Meaning =||
||SET      ||0     ||Set the value for the given key. All previous values for that key are discarded. ||
||ADD      ||1     ||Add a value for the given key. All previous values for that key are kept. ||
||DELETE   ||2     ||Delete a value for the given key. ||
||CLEAR    ||3     ||Clear out all meta data. Key MUST be set to NONE and value must be empty (0 bytes long). ||
||FINALIZE ||4     ||Inform the peer that all changes have been done and the result should become committed/active. ||