Kinematics and control modules

Adds the 'control' module to broccoli.

New Features

• [control]: A complete new module on control theory and kinematics
  • filters: Added various digital filter implementations
  • operators: Added signal operator implementations
  • sources: Adds signal sources, e.g. a multi-sine implementation
  • kinematics: Adds basic kinematics modules for serial robots
  • types: Contains generic signal types
• [core]:
  • VectorSpaceMapper: Adds a class to map vector spaces
  • type_traits: Added type traits file, e.g. to check if a type is an Eigen vector/matrix

Non-Breaking Changes

• [doxygen]: Fixed several issues