have compile/link time error for modules and cells declaration mismatch

[ethanrublee]

cell.cpp

ECTO_CELL(my_ecto_module, my_ecto_module::Hello,"Hello", "Prints a string input to standard output.");

module.cpp

ECTO_DEFINE_MODULE(my_ecto_module){}

CMakeLists.txt

ectomodule(my_ecto_module
  module.cpp
  cell.cpp
)

We should have some way of enforcing that they all match at compile time... Its a weird error to track down at runtime, if you aren't too familiar with all of the concepts.

Could possibly do it by checking for a #define ecto_MODULE MODULE_NAME and also have some link error that will occur...

[ethanrublee]

Have a sketch of this going... error message has something like module_must_be_named_whatshouldinameyou
in the error.

Added a few compile tests for this.

[ethanrublee]

Depends on the module_ectomodule_EXPORTS define.

[ethanrublee]

Works for me.