• put same name submodule, module into src/same.f90
• removed unneeded compiler options for clarity
• general cleanup of cruft

• use setup.cmake for simpler build and test
• put implicit none everywhere to reflect better how submodules are actually used.

the cmake generators didn't work for this type of applications

• Update CMake to allow non-Make generators to fully build project
• modernize CMake to use target properties rather than throwing everything in CMAKE_BINARY_DIR
• cleanup Meson
• rename external module to constants for better example usage

cmake: disabled examples that it can't build due to bugs in Cmake submodule syntax.
Meson is fine with all examples.

Thanks to @zbeekman correct module naming to avoid module namespace clashes.

Noted that even CMake 3.16.2 cannot handle module pure function foo() but Meson can.