PRC-773, PRC-776: updates to application service

[severinbeauvais]

PRC-773: added missing things to get Application

• overrode pagination when retrieving applications (max 1M results)
• fixed getByTantalisID() to get extra app data
• added missing comment count
• added missing \n replacement for descriptions
• added missing 7-digit CL code
• updated headers to display modified CL code
• misc cleanup

PRC-776: parameterized application 'get' functions + model cleanup

• refactored code to use common function to retrieve extra app data
• parameterized application 'get' functions to retrieve only required extra data
• removed obsolete app caching
• moved some property code to models
• added 'user-friendly display' fields to app model for better typing
• added missing document and features copy code to app model
• a bit of cleanup