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Improve type discipline and target C18

Reid Rankin requested to merge reidrankin/apk-tools:reidrankin-c18 into master

I've gone through the codebase and done some cleanup work:

  • made typecasts, especially to and from signed integers, explicit
  • change GNU-specific language extensions into their annotated forms
  • a few name changes to avoid ambiguity (for example, avoiding 'new' and 'delete' since c++ uses those as reserved words)
  • changing the compilation target from gnu11 to c18 (saves about 5KB off the stripped binary size)

None of this should change existing behavior, but should hopefully help maintainability.

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