[make:*] use sorted use statements

[jrushlow]

• removes manual use statements from templates, use statements are generated by UseStatementGenerator
• remove legacy code and logic from make:command
• adds the ability to use statements with aliases needed in 1107. e.g. use \Symfony\Something as Else;
• removes some legacy code from make:registration. Remainder to be removed in [make:user] Legacy <= 5.3 & Doctrine Cleanup #1107

[weaverryan]

2 minor comments!