Created a configuration base class that defines an include_helper method to act as a shorthand for accessing configuration methods
Have all configuration classes inherit from the new base class
Revert "Created a shorthand module to avoid having to type the long Dcmgr::Configurations line every time"

This got replaced by the new Configurations::Base class and its include_helper method.

This reverts commit 234e6259e37d447abfcf71627de8c5c5c82780be.

Conflicts:
	dcmgr/lib/dcmgr/configurations.rb
Revert "Use configuration shorthand in bin/collector"

This also needs to be reverted since we're using the include_helper methods of configuration classes instead.

This reverts commit 19aedace348e778f52aaeadefda6cc48b2249ef5.
commited the base class that the old configurations are now inheriting
Reinstated Dcmgr::Configurations.method_missing which was deleted accidentally when reverting the shorthand