Bump version to 2.0-rc18

impl: Add the roaming state to ActiveConnection

In some of the use cases, I needed the active
connection to keep living after the server thread
that spawned it went out of scope. This change
makes it possible by adding a new state called
'roaming' which allows the server (or any other
owner) to skip closing the instance.

pom: Separate github and ossrh profiles and their requirements for de…

…ployment

Use a specific version of JetBrains Annotations and bump version to 2…

….0-rc15

Bump version to 2.0-rc13

Bump version to 2.0-rc11

Bump version to 2.0-alpha10 and org.json:json to 20201115

Bump version to 2.0-rc09

Bump version to 2.0-rc08 and update a comment

Set the default encoding to UTF-8