Extract out a reusable configuration

[jhickman]

There may be need to reuse bindings. This could be due to needing to hold onto the configuration as we may be removing old Node's and appending new Nodes that need the same shortcuts, or being able to use the same bindings on multiple Nodes where we don't want to apply the listener at a common parent Node.

Extract out a configuration class such that we can perform the same actions such as:

config.bind("ctrl+c", this::onCopy);
config.removeAll();
// etc