New package django-content-settings-curuser

[oduvan]

store current user in global, and define new template classes that work with global user

• DjangoTemplateCurUser
• DjangoTemplateCurUserNoArgs
• SimpleEvalCurUser
• SimpleEvanCurUserNoArgs
• SimpleExecCurUser
• SimpleExecCurUserNoArgs

cur user can be passed as an optional argument, in that case DjangoTemplateCurUser works the same as DjangoTemplate