🔨 build: Update CXX standard to 14

[dillionverma]

What?

Bump CXX standard to c++ 14 for libwally.

Why?

As of right now, cfd-dlc-js builds perfectly fine on node v14. However, when attempting to build node.js projects with cfd-dlc-js on node v16, the compilation fails with a very similar error message to the one described here:
nodejs/node#38367

 error: no template named 'remove_cv_t' in namespace 'std'; did you mean 'remove_cv'?
            !std::is_same<Data, std::remove_cv_t<T>>::value>::Perform(data);
                                ~~~~~^~~~~~~~~~~
                                     remove_cv

Digging deeper, I discovered that if I set CXX version of libwally (which is a dependency of cfd-dlc-js) to 14, then everything builds successfully on nodejs v16.

[k-matsuzawa]

@dillionverma
Thanks!
I think we need to release all of them, so we will release them one by one.
(libwally-core, cfd-core, cfd, cfd-js)

[k-matsuzawa]

@dillionverma
I have released all of them. Use these:

• cfd-js: v0.4.5
• cfd: v0.4.5
• cfd-core: v0.4.4
• libwally-core: cfd-0.4.7

[dillionverma]

Thank you!!