Minor bugfix: Added missing composer dependency to ServiceManager
Merge pull request #5186 from dol/bugfix/missing-servicemanager-dependency

Minor bugfix: Added missing composer dependency (ServiceManager) to Math package
[#5186] incorporate feedback

- Moved servicemanager to suggested dependency
- Added ext-bcmath and ext-gmp as suggested dependencies
Merge branch 'hotfix/5186'

Close #5186