require modules instead of namespace

[pablomayobre]

As discussed in Discord:

Namespaces make weak relationships between modules. This means that for dialogue.lua to work init.lua needs to correctly place node.lua in Namespace.node which is a possible point of failure.

You may later revisit node.lua and or init.lua and then dialogue.lua would stop working because it can't find what it's searching for in Namespace.node

Directly requiring node.lua in dialogue.lua would fix this issue, since you can clearly see what file depends on what other file.

Namespaces are generally useful when you need to require tens of files in a single file, or when you have recursive dependencies. But neither is the case, Babble is pretty module and all the files require 1 other file or none at all.

[Keyslam]

Namespace has been removed. Files now have to explicitly require their dependencies. Init.lua now contains a table that is filled and returned with all modules.