Name Conversion Methods and Variables after Xtext Grammar

[farhan5248]

Graph Model changes. Do this first to make the other naming changes easier

• For Path Info rename to Coverage Criteria
• Create a Path Info for scenario outlines, examples

Name the methods in the wrappers after Xtext language elements

• Name variables as srcStep or srcScenario
• get/set. for types or terminals
• add/remove for lists. when adding type or terminal to a type list
• create for types passing in name attribute. when creating something, always pass in the name like for createExamples(interaction, examplesName)
• List like tagList or lineList instead of tags or lines unless those are language elements

[farhan5248]

This work might not be needed as it's being covered by #125

[farhan5248]

Use this to do the following

1. Make a list of all the language elements in the xtext file.
2. Create set, get, create, add and *List method naming conventions
3. Ensure each wrapper follows the conventions by adding interfaces. I might have to rename PathInfo to Coverage and add stereotypes for the coverage like background, scenario, scenario outline, examples and examples row. outlines and examples won't have any tagged edges, just name, tags, descriptions