Add support for modular build structure. (#36)

* Make the library modular usable.

* Switch to library requirements instead of source. As source puts extra source in install targets.

* Add requires-b2 check to top-level build file.

* Bump B2 require to 5.2

* Change all <source> references to <library>.

* Update copyright dates.

* Move inter-lib dependencies to a project variable and into the build targets.

* Switch to /boost/test//included target for header only mode of Boost.Test.

* Update build deps.

* Add GHA CI with simpler working one based on alandefreitas/cpp-actions utilities.

* Move project global include to target local include.

* Only msvc gets minor version tests.

* Remove GHA CI to undo move to cpp-actions.

Author: grafikrobot

build.jam

@@ -0,0 +1,30 @@
+# Copyright René Ferdinand Rivera Morell 2023-2024
+# Distributed under the Boost Software License, Version 1.0.
+# (See accompanying file LICENSE_1_0.txt or copy at
+# http://www.boost.org/LICENSE_1_0.txt)
+
+require-b2 5.2 ;
+
+constant boost_dependencies :
+    /boost/array//boost_array
+    /boost/assert//boost_assert
+    /boost/concept_check//boost_concept_check
+    /boost/config//boost_config
+    /boost/core//boost_core
+    /boost/functional//boost_functional
+    /boost/iterator//boost_iterator
+    /boost/mpl//boost_mpl
+    /boost/static_assert//boost_static_assert
+    /boost/type_traits//boost_type_traits ;
+
+project /boost/multi_array
+    ;
+
+explicit
+    [ alias boost_multi_array : : :
+        : <include>include <library>$(boost_dependencies) ]
+    [ alias all : boost_multi_array test ]
+    ;
+
+call-if : boost-library multi_array
+    ;

test/Jamfile.v2

@@ -6,6 +6,8 @@
 
 import testing ;
 
+project : requirements <library>/boost/multi_array//boost_multi_array ;
+
 compile-fail fail_cbracket.cpp ;
 compile-fail fail_cdata.cpp ;
 compile-fail fail_citerator.cpp ;
@@ -15,7 +17,7 @@ compile-fail fail_csubarray.cpp ;
 compile-fail fail_csubarray2.cpp ;
 compile-fail fail_csubarray3.cpp ;
 compile-fail fail_cview.cpp ;
-compile-fail fail_cview2.cpp ;
+compile-fail fail_cview2.cpp : <library>/boost/test//included ;
 compile-fail fail_cview3.cpp ;
 compile-fail fail_ref_cbracket.cpp ;
 compile-fail fail_ref_cdata.cpp ;
@@ -28,7 +30,7 @@ compile-fail fail_ref_csubarray3.cpp ;
 compile-fail fail_ref_cview.cpp ;
 compile-fail fail_ref_cview2.cpp ;
 compile-fail fail_ref_cview3.cpp ;
-  
+
 run constructors.cpp ;
 run access.cpp ;
 run compare.cpp ;