Terraforming unique! 'Turn this tile into a [terrainName] tile'

Fix timed uniques without other conditionals

Only allow a trigger-based unit action if actionable

By SomeTroglodyte:
- Conditional 'While Researching'
- External links: Right-click and some housecleaning
- Fix Maya "Long Count" unlock translations

By SeventhM:
- Fix victory focus being ignored
- Add unique for Personality to avoid building object