mathter: add new version 2.0.0

[petiaccja]

Summary

Changes to recipe: mathter/2.0.0

Motivation

Publishing a new version of this library on conan so that it's more accessible to users.

Details

• Moved previous versions (previously all folder) to the 1.x.x folder
• Version 2.0.0 and on (now the all folder) has a different method for packaging:
  • The library stayed header-only, but...
  • The library was updated to support CMake's --install option to install the headers
  • The conanfile.py now uses the CMake install procedure, like for a compiled a library
  • The CMake installation is tested on the library's own CI and its logic is not duplicated in the conanfile.py

---

• Read the contributing guidelines
• Checked that this PR is not a duplicate: list of PRs by recipe
• Tested locally with at least one configuration using a recent version of Conan

[conan-center-bot]

Conan v1 pipeline ✔️

All green in build 5 (d12c2b2065fab705152f61e4689906683317fe38):

• mathter/1.1.1:
  Built 5 packages out of 11 (All logs)

• mathter/1.1.0:
  Built 5 packages out of 11 (All logs)

• mathter/1.0.0:
  Built 5 packages out of 11 (All logs)

• mathter/2.0.0:
  Built 5 packages out of 11 (All logs)

• mathter/1.0.1:
  Built 5 packages out of 11 (All logs)

---

Conan v2 pipeline ✔️

Note: Conan v2 builds are now mandatory. Please read our discussion about it.

All green in build 5 (d12c2b2065fab705152f61e4689906683317fe38):

• mathter/1.1.1:
  Built 2 packages out of 5 (All logs)

• mathter/1.1.0:
  Built 2 packages out of 5 (All logs)

• mathter/1.0.1:
  Built 4 packages out of 5 (All logs)

• mathter/1.0.0:
  Built 4 packages out of 5 (All logs)

• mathter/2.0.0:
  Built 4 packages out of 5 (All logs)

[AbrilRBS]

Looks great, thanks a lot for taking the time to update the recipe, we appreciate it :)