Split job into model and index classes

[SugaryLump]

• The Job class has been split into [Job.java](http://job.java/) and [IndexedJob.java](http://indexedjob.java/), to work like entities in the code base that are split between a model class and an indexed class
• A job's source objects are no longer indexed
• Instances of Job usage in the codebase were replaced or overloaded where relevant to use either IndexedJob or more specific properties of a job
• Any instance in the codebase where an indexed job's source objects were consulted now has a model access to retrieve this data
  • As an exception, tables that list jobs NO LONGER load data for job source objects, and this data is no longer included when exporting these tables to CSV
• A new API method getJobFromModel' was added at /api/v2/jobs/{id}` that retrieves a job from the model with permission checking
• The API method getJobPluginInfo now receives a dedicated PluginInfoRequest with only the required details as a path parameter instead of receiving a full Job object