Pentarctagon ad3f1c95b0 Add support for distinct sub-achievements.
This adds support for having up to 28 distinct sub-achievements within a single achievement. This limit exists since wesnoth's layout isn't smart enough to tell a horizontal listbox to actually use its scrollbar instead of forcing a horizontal scrollbar on the whole window.

Additionally this adds the [set_sub_achievement] and [has_sub_achievement] WML tags and their respective lua functions. [has_sub_achievement] is unsafe for use in MP, for the same reasons that [has_achievement] is.
2023-05-17 23:54:16 -05:00
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