CMC_EXT_INIT should be there by default

[duarm]

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Feature Request Template

What is the nature of this request?

• Change in standards

Is your feature request related to a problem? Please describe.

CMC_EXT_INIT just adds two new functions, they should be there by default and save everyone the hassle. Unused functions can be easily stripped from release builds.

Describe the solution you'd like

remove CMC_EXT_INIT, have _init functions by default.

[LeoVen]

This will be implemented together with #36