Update 0.6.177 Less snowballing

Optimization

Optimized the download speed of some resources in the game
Now plays a sound when invited by another player

Experience Adjustment

Increased the experience required for upgrading a units
Increased the experience given by killing high-level units
Greatly increased the experience required to upgrade Rhino

Other Balance Adjustments

Rhino health reduced by 10%
Rhino [Power Armor] health bonus adjusted from 35% to 25%
Overlord [Overlord Artillery] price reduced from 300 to 250
Overlord [Jump Drive] cost increased from 50 to 100
Sentry Missile damage adjusted from 6000 to 5000

Bugfixes

Fixed an error in the description of the [Armor Enhancement] technology for giant units
Fixed an error in the description of [Missile Device Specialist]
Fixed an issue where the tournament registration would not display properly
Fixed an issue where sometimes switching chat channels would not work properly