Added SMODS.can_context_retrigger() and SMODS.can_context_post_trigger() util functions

[AllUniversal]

+Title, these replace the hardcoded context flag checks and newly (fully) prevent context.mod_probability/etc. from being retriggered/post_triggered.

! I'm not sure how SMODS.calculate_repetitions() works exactly, maybe someone take a look whether it needs to be adjusted as well.

Additional Info:

• I didn't modify api's or I've made a PR to the wiki repo.
• I didn't modify api's or I've updated lsp definitions.
• I didn't make new lovely files or all new lovely files have appropriate priority.

[AllUniversal]

I've had a discussion about whether certain contexts should be post_triggerable, and though I can see the use in it, it seems to inevitably lead to problems which SMODS cannot easily (or at all) resolve on its end. Thus I've added some more contexts to the post_trigger/retrigger blacklist for now, specifically modify_weights, modify_scoring_hand and evaluate_poker_hand. Please let me know if an effect of yours requires these to be post-/retriggerable.

[nh6574]

debuff_hand should probably also be included