Limb tweaks

[EgorDinamit]

About the Pull Request

• Blood loss from burn damage is severely reduced;
• Robotic limbs have lesser chance to malfunction and malfunction threshold is increased twofold;
• Weakening from damaged feet/legs is reduced from 4 to 1.

Why It's Good For The Game

• Hit once with a laser? Say goodbye to all your blood. It's just not fun, especially against rapid-firing lasers;
• 10 damage threshold was simply ridiculous, making robotic limbs drop everything every ~5 seconds;
• Less silly stuns. Random stuns are bad!