Opcua-tools

This patch allows for handling of enums such that trailing and leading whitespaces are ignored when referring to an enum value. Additionally, it forces enums strings to follow the 'title' convention with spaces and the first of every word capitalized.

The major changes for this release are:

- Reimplementation of the Enumeration which is much faster
- The optional input argument `namespace_dict` to the function `UAGraph.from_path()` allows for nodes from a certain namespace uri to be allowed to a certain namespace index. Previously, a subset of the namespace uris could be specified, and the others would be append and randomly assigned. The new behaviour will not parse files which do not have `ModelUri` or `NamespaceUris` which are not found in the dict. In other words, if a `namespaces_dict` is passed, you must specify alle the namespaces you wish to be included in the UAGraph.