New: Seasons Clock

Provides an API for other mods to create "season clock" tables with various parameters (season names, durations, etc.) and then you can ask a season clock what the current season is. Plans include integrated-solar-energy-based seasons and per-position seasons where biome "heat" could be used instead as "equator-proximity" and the season clock could generate a season-appropriate time-varying heat value.

Source code (in sub-folder of main repo) at: https://codeberg.org/pmawhorter/mcremix/src/branch/main/mods/seasons_clock