SmrPlayer: remove internal improper references
SmrPlayer: remove internal improper references

See #317.

Fixes some warnings in PHP 7+ about only variables being passed
by reference (by removing the references).

Note: this does not change any of the interfaces; they will be
modified at a later date.

hemberger/smr,smrealms/smr,hemberger/smr,hemberger/smr,smrealms/smr,hemberger/smr,smrealms/smr