Modernize PrMCTools

• do not explicilty implement functions the compiler will generate implicitly
• do not keep variables with a lifetime scope of an event as members
• prefer std::unique_ptr over raw pointer and delete
• default arguments should be specified in declaration, not definition
• prefer override over virtual
• do not keep constants as member variable, but as static const in an anonymous namepsace
• prefer range-based for loops
• prefer for loop over while
• prefer getIfExists over exists/get combo
• do not check for duplicates while inserting (which is quadratic) but use sort / unique (which is logarithmic)