v0.9 changelog

Refactored codes, split sections into modules
Added GreenGenes 2024.10, updated GTDB to r220, and Silva to 138.2, please rerun download_db to get the latest version
Added new parameter --db_to_prioritize to allow users to specify which database to prioritize for taxonomy assignment.
- Prioritization of assignment by default is now GG2, then GTDB, then Silva.
Attempt to make tmpdir and cachedir more robust for QIIME2-related processes
- TMPDIR is now set to the current working directory
Update QIIME2 to 2024.10 version. Workflow tested with Nextflow 24.11.0
Switched to using QIIME2 official container instead of self-built one.

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