Add: replace command

[BrianHenryIE]

Currently (slowly) working on adding a basic rename namespace command which will not rely on composer.json

strauss replace --from "YourCompany\\Project" --to "BrianHenryIE\\MyProject" --paths "includes,my-plugin.php"

A lot of refactoring needed – e.g. making the config file a composite of interfaces required by different commands; add something of a pipeline of optional steps.

master...BrianHenryIE:strauss:change-namespace-in-project-source-files

Edit: This is working in the branch but the branch has some test mock expectations failing after refactoring.

[BrianHenryIE]

Completed in v0.20.0