Mechanic Improvement

[remance]

Feel free to posting improvement idea here. Also for when idea popup and I can't access the code.

• Charge damage also use speed as factor.
• Charge defense use troop size and maybe some sort of mass stat.
• Increase shoot range if shooting downhill.

[remance]

Added size and speed to charge calculation.

[remance]

Change norman cav spear to lance, also leader banner