Add --strict flag to apply command

[Mhanz3500]

Using --strict, the grain seed will not be randomized per-frame, and it will keep the original seed written in the fgs table.

This enables two main things:

1. Static grain.
2. Custom seed rotations for dynamic grain (with a long enough fgs table, you can cover all frames).

Combining the two you can also use it to have a mix of static and dynamic grain.

[shssoichiro]

• Problem: parse_grain_table(&grain_data)? already parses the E line seed into each GrainTableSegment.random_seed, but strict mode then re-parses the same text and linearly searches new_headers for every seed. For large per-frame grain tables this becomes O(n²) before processing starts, and the duplicate parsing path can drift from the library parser’s validation rules.
• Suggestion: Remove the extract_seeds_from_grain_table_text override path and rely on parse_grain_table for seed values; strict mode only needs to skip the later DEFAULT_GRAIN_SEED adjustment.

[Mhanz3500]

I'm a noob for github things

will change it when I have time, thanks!

[Mhanz3500]

this new commit should address the problem, for the test fixed it failed for scaling_shift set to 10 in the builder but tested 8 in the assert, I don't think it was intentional.