Custom Compiler/Engine for some templates

[MartinMystikJonas]

When Latte is used standalone for example to generate e-mail content we want to have option to say that given latte template is compiled using different Compiler/Engine than default.

All classes that currently get Compiler (CompilerInterface) as service from DI should accept it as parameter and use different compiler.

LatteTemplateResolver should be able to say that resolved templates use different Compiler/Engine. Maybe make it part od Template Value object.