Delete TR::SelectOpt, which is unused

[jdmpapin]

If there is a case in which it's desirable for an entry in _opts to select between two different Optimization classes based on an option, we can simply check the option where that entry is initialized, and use it to choose which factory function to pass to the OptimizationManager. Moreover, by checking the option there, we'll naturally take option sets into account.

[vijaysun-omr]

Jenkins build all

[vijaysun-omr]

Simple cleanup. Checks have passed. Merging