char set and collation

[JroachAu]

Hi,
Throughout these scripts its specified in code that char / collation refer to utf8 (i.e. utf8mb3).
Newer MySql versions use utf8mb4, with mb3 planned for deprecation.
Some parts of the script create tables/indexes etc without specifying 'utf8' and therefore are created to the default schema of utf8mb4.

I'll get around to raising my changes as a pull request if you'd like.