0.6.7.3 - Minor bug fixes and balance changes

Change log 0.6.7.3

General improvements
- Using TCP protocol instead of secure-UDP to be 100% sure of reliable connections during multiplayer games

Balance changes
- Wall takes 6 manpower seconds to construct (from 8)
- Wall costs 5 bricks (from 10)

Bug fixes
- After constructing clay pit and gathering bricks upon delivery villager will no longer find a fruit tree to pick instead
- Fixed some potential out of sync cases
- Fixed hotkey for garrisoning watchtower command
- Fixed wrong angle on gates