Upgrade Tor from 0.4.5.8 to 0.4.8.10

Tasks

• Upgrade Tor from 0.4.5.8 to 0.4.7.13 (!2 (merged)).
• Upgrade Tor to 0.4.8.10 (!6 (merged)).

Time estimation

• Complexity: very small (0.5 day)
• Uncertainty: low (x1.1)
• Reference (adapted)