CLI2: Migrated static methods

- The old CLI object has three static methods that are used for extracting
  information from the command line before parsing takes place. These include
  rc.name:value and rc:value and code that applies those overrides to
  Context::Config. These methods are moved to CLI2 - being static it makes no
  difference where they reside.
- Context::initialize now calls the CLI2 versions only.

src/CLI.h

@@ -65,9 +65,6 @@ class CLI
 {
 public:
   static int minimumMatchLength;
-  static void getOverride (int, const char**, std::string&, File&);
-  static void getDataLocation (int, const char**, Path&);
-  static void applyOverrides (int, const char**);
 
 public:
   CLI ();