cpp-peglib: modernize more

[SpaceIm]

Specify library name and version: lib/1.0

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• I've read the contributing guidelines.
• I've used a recent Conan client version close to the currently deployed.
• I've tried at least one configuration locally with the conan-center hook activated.

[conan-center-bot]

Conan v1 pipeline ✔️

All green in build 1 (08c0d0373f5008624a472098615d5de48d056c0a):

• cpp-peglib/1.8.2@:
  All packages built successfully! (All logs)

• cpp-peglib/1.8.1@:
  All packages built successfully! (All logs)

• cpp-peglib/1.6.0@:
  All packages built successfully! (All logs)

• cpp-peglib/1.3.9@:
  All packages built successfully! (All logs)

• cpp-peglib/1.3.10@:
  All packages built successfully! (All logs)

• cpp-peglib/1.8.0@:
  All packages built successfully! (All logs)

• cpp-peglib/1.4.1@:
  All packages built successfully! (All logs)

• cpp-peglib/1.5.0@:
  All packages built successfully! (All logs)

• cpp-peglib/1.4.2@:
  All packages built successfully! (All logs)

• cpp-peglib/1.3.8@:
  All packages built successfully! (All logs)

• cpp-peglib/1.6.1@:
  All packages built successfully! (All logs)

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Conan v2 pipeline (informative, not required for merge) ❌

Note: Conan v2 builds are informative and they are not required for the PR to be merged.

The v2 pipeline failed. Please, review the errors and note this will be required for pull requests to be merged in the near future.

See details:

Failure in build 1 (08c0d0373f5008624a472098615d5de48d056c0a):

An unexpected error happened and has been reported. Help is on its way! 🏇