cbuilder: ccgexprs sweep part 2

[metagn]

follows up #24381

This is about another 30% of ccgexprs (remaining is up to around line 3000), stopped right before the point where #24391 is required.

The Genode::log and Genode::Cstring calls in genEcho are left as is but could be mangled in the future.

[Araq]

I don't know how :: would translate to NIFC.

It will simply produce \<hex value of ':'> * 2 and make it part of the C name.

[metagn]

Did the Genode echo too, the identifiers are left alone for now, in the future we will probably need to use some cIdent() wrapper for these direct uses of names that would include that transformation

[github-actions]

Thanks for your hard work on this PR!
The lines below are statistics of the Nim compiler built from c8072b1

Hint: mm: orc; opt: speed; options: -d:release
176590 lines; 8.573s; 655.16MiB peakmem