Add support for default targets
Description
Added functionality to all bst commands where applicable to use default elements
Running most commands without a defined element will now do one of 2 things.
- use a defined "default element" This element is declared in the project.conf
- If no default element is defined, buildstream will attempt to use all elements in the project
This is so you can run commands against all files in a project, not just those connected to a specific element.
This merge request is related to: #638 and #640 (closed)
This depends on !937 (merged)
Edited by Jürg Billeter