Added Lightning Damage Support

Adds additional lightning damage to linked skill(s).

Gem Leveling

Level	Required Level	Required Intelligence	Mana Cost Multiplier	Added Lightning Damage	Experience to Level
1	15	22	-	1-9	28,130
2
3
4	24	33	-	1-15	118,383
5	27	37	140%	1-17	175,816
6
7
8
9
10
11
12	49	63	140%	3-48	1,964,019
13
14
15
16	56	72	140%	3-63
17
18
19
20

Gem Quality

Each percentage of quality adds +1% Shock duration on enemies.