[0005] cmangos-classic update z1994 and fixed EOL in recent files

Implement creature_linking by guid by Schmoozerd

https://github.com/cmangos/mangos-classic/commit/0d5c84f9572ecfd68cf86b1af5a57e83a1743e14
[0006] cmangos-classic update z2047

Improve some mangos_string texts and command help texts by bugeyedcreepy

https://github.com/cmangos/mangos-classic/commit/72b0dc39694229cdfd76dc51204bddaa4d1d103b
[0007] cmangos-classic update z2051

Apply CREATURE_FLAG_EXTRA_NO_TALKTO_CREDIT to all creatures by
Schmoozerd
The flag was introduced in [s1442]. It is assumed that by now all quests
that require some talk-to credit are handled by different means.
If you catch quests that don't work yet, remove this flag for this npc
and report to your DB provider.

https://github.com/cmangos/mangos-classic/commit/c2f3d55f1803ffa8eaad29f53f8f4c0c8723ebfb