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

Deactivate benchmark option on this branch. They were not build anyway.

Set C++17 as new standard

See merge request !15

Development/minor fixes

See merge request !14

Compile feature disabled as introduced in cmake 3.10 (current cmake required 2.8, update considered ?)

Need to do git add -f doc/source/X.png for the next static image to be added.

Meyer watershed segmentation.

See merge request !12

To avoid name clash with mln::transform

SE decomposition of disc and rect2d for dilation based algorithms.

See merge request !11