Skill ID Processing Overhaul

http://hercules.ws/board/topic/512-skill-id-processing-overhaul/
Signed-off-by: shennetsind <ind@henn.et>
Fixed Bug #7194

http://hercules.ws/board/tracker/issue-7194-guild-id-packets-sending-to-clients-is-wrong/
Signed-off-by: shennetsind <ind@henn.et>
Fixed Bug #7193 and ...

http://hercules.ws/board/tracker/issue-7193-monsterhp/
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Follow up 0f4a50d13538c3e5d3ca4d3822f92217c8da0479 re-introduced mob_max_skilllvl
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Updated some packet intro dates (special thanks to yommy! <33)

Signed-off-by: shennetsind <ind@henn.et>
Fixed Buying Stores on 2013 clients

Special Thanks to Yommy!

Signed-off-by: shennetsind <ind@henn.et>
Fixed Bug #7192

Fixed Buying Store for 2012-07-10 onwards clients, special thanks to Yommy <3
http://hercules.ws/board/tracker/issue-7192-crash-when-closing-buying-store-customer-2013/

Signed-off-by: shennetsind <ind@henn.et>
Fixed Bug #7184

Also fixed the tab alignment
http://hercules.ws/board/tracker/issue-7184-bug-in-icon-of-skill/

Signed-off-by: shennetsind <ind@henn.et>
Fixed missing default in upgrade file

All credits to kyeme! thank you!

Signed-off-by: shennetsind <ind@henn.et>
Introduced support for /guildinvite (present in 2012+ clients). Also merged both guild invite functions.

Signed-off-by: Matheus Macabu <mkbu95@gmail.com>
Merge branch 'master' of https://github.com/HerculesWS/Hercules