Breaking Changes

`packit`

#96: Breaking Change Ensures layer launch/build/cache flags get cleared on Layer.Reset method. Method now returns a Layer and error.
#98: Breaking Change Removes LayerType object and variadic option for Layer.Get method.
#99: Removes deprecated API and warning for the Processes, Slices, and Labels fields on the BuildResult type.
#99: Removes deprecated API and warning for the for the version field on BuildPlanRequirement type.

#99: Removes deprecated API and deprecation warning for include_files and pre_package fields in buildpack.toml.