Wrap task names in graph view

[jfrost-mo]

Problem

Long task names are common in cylc, especially where tasks are generated through jinja and whatnot. In the graph view these long task names are displayed on a single line, which makes them very wide, and causes the workflow to spread out such that it is hard to follow. To read the text easily you need to zoom in, but then you can't see much of the overall workflow.

Proposed Solution

The task names should be wrapped after a certain maximum length.

It should possibly also be truncated beyond a few lines to prevent ridiculously long names from breaking the UI layout, but this limit should be quite long so useful task name information is not lost.