Config: Add a few helper functions for repetitive tasks

Getting and setting configuration from the base config layer are common
and repetitive tasks. This commit adds some simpler to use functions to
make the new system easier to work with.

Config::Get and Config::Set are intended to make switching from
SConfig a bit less painful. They always operate on the main system.

Example usage:

    // before
    auto base_layer = Config::GetLayer(Config::LayerType::Base);
    auto core = base_layer->GetOrCreateSection(Config::System::Main, "Core");
    u8 language;
    core->Get("Language", &language, 0);
    SetData("IPL.LNG", language);

    // now
    auto base_layer = Config::GetLayer(Config::LayerType::Base);
    auto core = base_layer->GetOrCreateSection(Config::System::Main, "Core");
    SetData("IPL.LNG", core->Get<u8>("Language", 0));

    // or simply
    SetData("IPL.LNG", Config::Get<u8>("Core", "Language", 0));

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