Added Cold Damage Support

Adds cold damage to the linked skill(s).

Gem Levelling

Level	Required Level	Required Dexterity	Mana Cost Multiplier	Added Cold Damage	% Increased Chill Duration
1	15	22	140%	4-6	25%
2	18	26	140%	5-8	26%
3
4
5
6	30	40	140%	9-14	30%
7
8
9
10
11
12
13
14
15
16
17
18
19
20

Gem Quality

Each percentage of quality adds +0.35% Chance to freeze.