chore!: deprecate any_color_converted_view (#678)

color_converted_view has the same implementation and can be used
as a replacement, providing the same functionality.

This builds on #660 by @marco-langer (Thank you!)

Due to the fact that the switch to C++14 has been announced in #677,
we can now officially use the [[deprecated]] attribute which was standardized
in C++14.

This is initial part of deprecating the `any_color_converted_view` and
as @marco-langer pointed in
#660 (comment)
there are more changes to follow.

RELEASES.md

@@ -26,6 +26,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
   Currently, large parts of GIL still compile with a C++11 compiler. However,
   there is no guarantee that it stays that way, and any compilers that do not
   support at least C++14 are considered unsupported as of now.
+- BREAKING: `any_color_converted_view()` is deprecated and will be removed in the next release.
+  Use `color_converted_view()` instead, which provides the same feature.
 - documentation: Display that GIL is a header-only library
 - Moved numeric extension to core ([PR #573](https://github.com/boostorg/gil/pull/573))
 - Added support for C++17's `<filesystem>` ([PR #636](https://github.com/boostorg/gil/pull/636)).

include/boost/gil/extension/dynamic_image/image_view_factory.hpp

@@ -379,6 +379,7 @@ auto color_converted_view(any_image_view<Views...> const& src)
 ///        These are workarounds for GCC 3.4, which thinks color_converted_view is ambiguous with the same method for templated views (in gil/image_view_factory.hpp)
 /// \tparam Views Models Boost.MP11-compatible list of models of ImageViewConcept
 template <typename DstP, typename ...Views, typename CC>
+[[deprecated("Use color_converted_view(const any_image_view<Views...>& src, CC) instead.")]]
 inline
 auto any_color_converted_view(const any_image_view<Views...>& src, CC)
     -> typename color_converted_view_type<any_image_view<Views...>, DstP, CC>::type
@@ -392,6 +393,7 @@ auto any_color_converted_view(const any_image_view<Views...>& src, CC)
 ///        These are workarounds for GCC 3.4, which thinks color_converted_view is ambiguous with the same method for templated views (in gil/image_view_factory.hpp)
 /// \tparam Views Models Boost.MP11-compatible list of models of ImageViewConcept
 template <typename DstP, typename ...Views>
+[[deprecated("Use color_converted_view(any_image_view<Views...> const& src) instead.")]]
 inline
 auto any_color_converted_view(const any_image_view<Views...>& src)
     -> typename color_converted_view_type<any_image_view<Views...>, DstP>::type