Common Unit Types / Helper Functions

When writing a bot, several unit types of a race are often required. It would be nice if the Race namespace had the following functions:

sc2::Race::GetTownHall(race) -> returns the UnitTypeID of Nexus if race == Protoss, for example
sc2::Race::GetSupplyProvider(race)
sc2::Race::GetWorker(race)
sc2::Race::GetRefinery(race)

It would also be quite nice to have something like an sc2::UnitType namespace, in which the following functions existed:

sc2::UnitType::IsTownHall(id)
sc2::UnitType::IsSupplyProvider(id)
sc2::UnitType::IsWorker(id)
sc2::UnitType::IsRefinery(id)
sc2::UnitType::IsGeyser(id)
sc2::UnitType::IsMineral(id)
sc2::UnitType::IsBuilding(id) -> whether the given type is a building
sc2::UnitType::WhatBuilds(id) -> id = barracks returns SCV, id = marine returns barracks, etc