The 'convert' rule

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When writing

   obj obj1 : a.cpp ;

V2 compiles a.cpp to create obj1.obj target. Sometimes it's desirable to convert source into different target type without changing the name. For example:

   somehow-processed-cpp p : a.cpp b.cpp c.cpp ;

It differs from the above in that the names of sources are preserved. This effect can be achieved either by a new rule 'convert', or some feature, say <name>"";