Packet Database Overhaul

[Aleos 465]

Packet Database Overhaul
As of Git Hash: f0ab8d2, the packet database has had a complete overhaul!

Thanks to @Lemongrass for his work on it!

What does this mean?

• The clientinfo.xml client version value will be ignored from now on.
• The src/custom/defines_pre.h and src/custom/defines_post.h are there for people their own packets, set PACKETVER, and set custom Packet Obfuscation keys without having to modify the default header files.
• By setting PACKETVER the server will configure everything else on it's own from now on.
• Custom Packet Obfuscation keys use the following format:

#define PACKET_OBFUSCATION_KEY1 <key1>
#define PACKET_OBFUSCATION_KEY2 <key2>
#define PACKET_OBFUSCATION_KEY3 <key3>

• The shuffled packets and official obfuscation keys are in their own header files for easy lookup.
• Adds support for a lot of missing clients and features for almost all clients from 2016 and 2017.
• Dropped atcommand reloadpacketdb and script command is_clientver.