gcc-9 gcc-10, clang-10 packages with C++20
shared/no shared are now generated and uploaded.

Calls to ``::ranges::views::filter(rng, func)`` were ambiguous with the overload
``::ranges::views::filter(Predicate, Projector)``

Calls are replaced by the non-conflicting declaration ``::ranges::cpp20::views::filter``.

Update documentation

See merge request !101

Improve conan buildsystem

See merge request !100

Requirements from rangev3.

Do not rely on cmake to build.

Rename mln_foreach_new -> mln_foreach.

Rename new_pixel/new_pixel_type -> pixel/pixel_type.

See merge request !99

* Add clang 10, gcc 10 build in gitlab-ci.
* Make only debug build automatic
* Readme support section updated

* Tag final classes as final.
* Fix concept-based specialization
* Fix warnings

* Rename deprecated GTest TEST_CASE in TEST_SUITE.
* GTest is set as a conan build depedancy

* Fix namespace ::ranges::view -> ::ranges::views.
* Fix bad concept checking in extensions.

Merge 0.1 head

See merge request !97

Use a 2D graphic library for this pupose.

Freeze 0.0.1 version in master branch

See merge request !96

Compilation fixes for VS 2019

See merge request !83