Prevent default components being merged with user-defined components

[kurbar]

Hello,

Currently when you have only a few components defined in your semantic.json file, it also merges the other components on top of the selected components from defaults.

The issue with it is, if you want to compile a custom semantic build without all of the components, it's not possible. This is due to the deep copy been set to true for extend.

Setting it to false allows you to compile a semantic build with only the components you want.

[jlukic]

I just need to verify this doesn't effect any other settings that might need extend to be deep.

[jlukic]

Everything's good. The PR has some extra commits, manually merging in fix. 1.7.3