Previously `aliases` was conflated with global_aliases. This commit
fixes this.
`global_alias`'s are a name that can be used in top level configuration
and set the values of one or more plugin parameters that use the same
global_alias.
`aliases` is a list of alternative names for a configuration point.
Currently this is only used for instrumentation/instruments and
workload_name/name but in the future it will likely be used when
parameters have to be renamed to be more meaningful but still
maintain backward compatibility.
All config now uses configuration points
Config parsing is now done in destinct stages
- first all files are parsed and sent to their corresponding config objects or to a tree
- tree is traversed to generate job specs.
