2nd GDI Mission Bugs

[Zack K.]

• Silos do not give Tiberium on Capture. (as well as this, https://bitbucket.org/adityaravishankar/command-and-conquer/issue/10/2nd-gdi-mission-silos)
• Construction Yard does not give option to build hand of nod on capture.
• AI doesn't try to repair buildings.
• Humvee gets stuck in sand bags beside own base.