Dynamic module loading

[gogo40]

We need a support to dynamic module loading! This is fundamental to simplify the language extension and management.

#include <clever.h>

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class DynamicModule: public clever::Module {
/*
module implementation/declaration
*/
}

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CLEVER_EXPORT  void entry(Clever* c) {
            ....
            c->addModule(new DynamicModule);
            ....
}