Additional Information Required in UnitTypeData

One piece of critical information remaining to include in the API is to query which unit type performs a given ability. This is necessary to deduce which unit builds a building, trains a unit, etc, which is necessary for build order functionality. Currently Command Center hard-codes a huge table of relevant values, for which this is the only remaining value that currently isn't in the API.

I think that the best place to put this would be in the corresponding AbilityData entry. It may also need to be a vector since in some cases, multiple unit types can perform the same Ability: for example, a Hatchery and a Lair can both research Burrow (or at least they could in BW).

Similarly, it would be beneficial to also annotate UnitTypeID with a corresponding UnitTypeID for what builds the given type (ex: probe builds pylon). This could be inferred from the type's ability, but that's a pretty annoying 2-step query to make so it might be worth it to include this separately for units.

**Edit**: Merging this issue with additional requested information, as follows:

Right now, each UnitTypeData has a tech_requirement field. However, there are two separate prerequisite types for building units: buildings, and upgrades, for example:

Dark Templar requires a DT shrine to build.
Warp Gate requires sc2::UPGRADE_ID::WARPGATERESEARCH to build

I think there should be two separate fields to distinguish this for completeness. Also, tech_requirement is a bit of a misnomer since there aren't any 'techs' in the api, just unit types or upgrades. I suggest that UnitTypeData have the following fields:

required_unit_types = vector of unit types required to build the given unit type
required_upgrades = vector of upgrade types required to build the given unit type