Update GOKZ to be 1.11 compatible

[zer0k-z]

Most of these changes are just adding a return value to functions. Some function types are changed but shouldn't change any real behavior. Each commit corresponds to a plugin, and the workflow sourcemod version is moved to 1.11.
A few notable plugins:

1. gokz-global: I had to modify the default values of natives in GlobalAPI.inc. I'm not a big fan of this but it should work as a temporary solution.
2. gokz-core: NextIndex already exists in an include file.
3. gokz-jumpstats: !coordDist has to be casted back to int.
4. gokz-replays: Changed a variable name because it conflicts with a type definition.

[Sikarii]

I seem to have forgotten to submit my review.