Create JSON parser for single variant applications at built time. Given the JSON defined in bug 899079 that defines the custom applications for some operators depending on the MCC / MNC, create a parser able to: - For each application download the minimanifest. - Check if the application is stored in the distribution folder. - If download fails, use the stored application. - If it is stored, check if remote manifest has changed. If so, download again the application, else use the stored one. - If the application is not stored, download it. Using the input JSON, generate two JSON files that will be used when the SIM is inserted (893800): - One to be able to determine wich apps should to be installed. - One to configure how apps should be placed in the homescreen