Decoupling

- Eliminated some calls to context.config from Task‥cpp, reducing the coupling.
  If context can be eliminated from Task.cpp, via statically initialized
  variables, then Taskwarrior and the task server can share Task.{ḩ,cpp} which
  would be an enormous saving in effort.

(cherry picked from commit 215b03b1a7f47299a0d3e64331c7e3c962b4caf0)

src/Context.h

@@ -74,6 +74,7 @@ public:
   void decomposeSortField (const std::string&, std::string&, bool&);
 
 private:
+  void staticInitialization ();
   void assumeLocations ();
   void createDefaultConfig ();
   void loadAliases ();