Added Cold Damage Support

Adds cold damage to the linked skill(s).

Gem Leveling

Level	Required Level	Required Dexterity	Added Cold Damage	% Increased Chill Duration	Experience to Level
1	15	22	4-6	25%	28,130
2	18	26	5-8	26%	47,943
3	21	30	6-9	27%	77,012
4	24			28%	118,383
5	27	37	8-12	29%	175,816
6	30	40	9-14	30%	254,061
7	33	44	11-16	31%	359,090
8	36	48	12-18	32%	703,128
9	40	52	14-21	33%	755,049
10	43			34%	1,426,490
11	47	61	18-28	35%	1,488,645
12	49	63	20-30	36%	1,964,019
13	52	67	22-33	37%	2,573,731
14	54	69	24-36	38%
15	55	70	25-37	39%	9,930,867
16	56	72	26-38	40%	21,335,597
17
18
19
20

Gem Quality

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