[z2188] Continued MaNGOS 0.12.2 Release

Signed-off-by: Xfurry <xfurry@scriptdev2.com>
[z2189] Fix creature spline relocation with ForceDespawn command

Thanks to tarwyn and Grz3s for reporting the issue

(based on commit [12271] - 747a0ef)

(based on commit [s1822] - 415ad58)
[z2190] Rewrite GetHeight functions to return a reasonable height if possible

Thanks to Cyberium for problem research, suggestions and discussion

(based on commit [12273] - f98a3a0)

(based on commit [s1823] - f619332)
Fix a typo

(based on commit f4a5f0f)

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

(based on commit 0696e7b)

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