Add some tests and refactor test suite

tests/generators/nim/test_enum_initial_val.c

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+enum color { RED = 1, GREEN, BLUE};

tests/generators/nim/test_enum_initial_val.nim

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+type color = enum RED = 1, GREEN, BLUE

tests/generators/nim/test_func_2args.c

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+int sub(int x, int y);

tests/generators/nim/test_func_2args.nim

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+proc sub(x: cint, y: cint): cint

tests/generators/nim/test_macro_multi.c

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+#define SIMPLE 42
+#define FUNC foo(SIMPLE)

tests/generators/nim/test_macro_multi.nim

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+const SIMPLE = 42
+const FUNC = foo(SIMPLE)

tests/generators/nim/test_macro_simple.c

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+#define SIMPLE 42

tests/generators/nim/test_macro_simple.nim

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+const SIMPLE = 42

tests/generators/nim/test_macro_simple_func.c

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+#define FUNC foo(42)

tests/generators/nim/test_macro_simple_func.nim

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+const FUNC = foo(42)