v7.0.0

• [Breaking] Switch to libdeflater as the default
• [Breaking] Rebalance presets
• [Breaking] Update safe headers to remove
• [Breaking] Bump minimum Rust version to 1.61.0
• [Feature] Introduce new filter strategies
• [Feature] Allow setting libdeflate compression level
• [Feature] Add optional dockerization
• [Improvement] Improve alpha reductions
• [Improvement] Fast deinterlace for 8-bit
• [Improvement] Refactor heuristics for fast filter evaluation
• [Improvement] Improve file size reduction further
• [Bugfix] Avoid printing output bytes on decompress error
• [Bugfix] Fix compression level 0
• [Bugfix] Fix directional alpha reductions
• [Bugfix] Fix edge cases in palette reduction