Refactor grammar

Please refactor the grammar to

package de.monticore.lang.monticar;

grammar EMADL extends de.monticore.lang.embeddedmontiarc.EmbeddedMontiArcMath,
                      de.monticore.lang.monticar.CNNArch{

    start EMACompilationUnit;

    BehaviorEmbedding = Architecture | MathStatements;

    BehaviorName = name:"CNN" | name:"Math";

    token NEWLINETOKEN =
             ('\r' '\n' |
             '\r' |
             '\n' ):;
}

in order to avoid the unnecessary non-terminal EMADLCompilationUnit, c.f. http://monticore.de/MontiCore_Reference-Manual.2017.pdf Listing 4.25

and to inherit from EmbeddedMontiArcMath instead of EmbeddedMontiArcBehaviour

Please also analyse why the newline token needs to be overriden here (MC bug?)