Remove all implementations of the global `activate` method

[sbellware]

Use class methods in cases where a global macro would have been used:

Constant::Import.(EnvVar)

It's not worth it to activate a macro globally just for these infrequently-used environment initialization statements.

Also, almost all uses of activate have been removed from Eventide, preferring to include the utility module in question into the class, eg: Dependency, Initializer, etc