Fonts: parameters to change typealias name & struct name

[djbe]

Fixes #647.

Mirrors the implementation from the xcassets templates.

[SwiftGen-Eve]

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[AliSoftware]

I don't think this is the best approach, because in other templates we've migrated away from those top-level typealiases and moved them inside the top-level enum (see here for example)

So I think a better approach would be to remove those top-level Font type aliases and to instead define them inside the enum {{enumName|default:"FontFamily"}}. That way we avoid the risk of conflict between SwiftUI.Font and FontFamily.Font.

[djbe]

You're right, why did I not think of that 🤦
I've reworked the PR as follows:

• parameter to change struct name (like xcassets)
• move platform typealias into struct (like xcassets)
• parameter to change typealias name (like xcassets)
• deprecate typealias (like xcassets)

Note that I've rebased all commits, as this is a full rework of the PR.

[AliSoftware]

just a conjugation typo and indent Q otherwise LGTM 👌