This includes updates for resolving all warnings provided by Ruby
for deprecations and/or removed methods. It also enables support
for Ruby 2.7 in the specification constraint as all 2.7 related
warnings are resolved with this changeset.
This adjusts how triggers are implemented during a normal run. Any
defined triggers which are applicable are located and injected into
the run stack as the stack is built, including hook type triggers.
Support is included for dynamic hook lookup.
The data type used when defining triggers has also been relaxed to
support symbols, strings, or constants.
