fix tank throw angle

Fix syntax errors causing some convars not being loaded. Everything works now. What a madness game I had...

Teehee~

Modify tank parameters to make it throw rocks more precisely

Tank balancing

+ Tanks now don't throw rocks too frequently. It happened to be a disadvantage when tanks fight players in an area that has many obstacles.
- Increase movement speed to 250
+ Decrease attack range to 50
- Closed-range attack happens more
- Swing range increases
+ Melee attack hitbox increases, hit players easier