Bug fixed: automatically switch to using Parsimony (instead of PLL) to build start trees for very large alignments

[trongnhanuit]

This pull request includes:

1. Automatically switch to using Parsimony (instead of PLL) to build start trees for very large alignments (#taxa * #sites >= 2^31).
2. Update the Github workflow to fix the recently emerged error about "Dangerous symlink" when installing Boost on Windows.

[bqminh]

good thx