[c12795] Chat system refactoring All chat function now call same method

I also reworked the packet structure to be more near of original.
Due to havy of code changed this commit need to be applyed carrefully.

Any feedback is welcome here or on cmangos.net

(based on commit [12587] - 1af082e)

Signed-off-by: Xfurry <xfurry@scriptdev2.com>
[c12796] Restore nix build. Also forget to remove one MANGOSASSERT + cosmetic stuff

(based on commit [12588] - bcb98ed)

Signed-off-by: Xfurry <xfurry@scriptdev2.com>
[c12797] New nix fix, sorry.

Enum place swap and a new include.

(based on commit [12589] - 0c97ffa)

Signed-off-by: Xfurry <xfurry@scriptdev2.com>
[c12798] Add BuildChatPacket comment, reorder parameters, correct a little bug gm name not showed on general channel (Thank to @Shauren for pointing).

(based on commit [12590] - f970cc5)

Signed-off-by: Xfurry <xfurry@scriptdev2.com>
[c12799] Fix freeze if opcode.txt file does not exist on .debug send opcode

Idea by @xjose93

Thanks to @evil-at-wow for feedback

(based on commit [12591] - 3772bd3)

Signed-off-by: Xfurry <xfurry@scriptdev2.com>
[c12800] Fix LANG_ADDON use on Guild Channels and avoid a possible crash.

Part of @rsa work too.

(based on commit [12594] - adcd491)

Signed-off-by: Xfurry <xfurry@scriptdev2.com>
[c12801] Imrpove readability of the code and avoid visual studio warning c4996 I don't think this can cause trouble with gcc but let me know if its the case.

(based on commit [12595] - 7e14a6c)

Signed-off-by: Xfurry <xfurry@scriptdev2.com>
[c12802] Avoid last Visual Studio warning.

(based on commit [12596] - 9f426bd)

Signed-off-by: Xfurry <xfurry@scriptdev2.com>
[c12803] Fix aura not removed in some case. ProcFlag test seem not enough in some case.

(based on commit [12597] - d02e72a)

Signed-off-by: Xfurry <xfurry@scriptdev2.com>