Configuration update and media setting

• Download configuration file if it is a webfile
• Download the configuration file directly to the config path and overwrite old file
• Add an interface to config directory path
• Prevent a crash from the deletion of the Handler where we are still using it
• Add synchronous mechanism to download file and Instance Manager deletion
• Add Command parser features : clean specific keys, parse from list of arguments
• Reorder config search to avoid unwanted config file overwrite
• Move CLI execution at the end of initialization
• Based openAppAfterInit on Manager and not on Handler
• Add Call feature to Command line (--call=)
• Launch a call on request
• Add generic parameters on show and call method to CLI
• Replace connectOnce function that didn't fully work by a connection on context where it is manage by Qt
• Remove redundant parser initializations
• Update SDK to fix configuration updates and FEC

-linphone-sdk!1345 (merged) -liblinphone!965 (merged) -mediastreamer2!325 (merged)