Move the definition of `build_plan`

src/dds/build/iter_compilations.hpp

 #pragma once
 
-#include <dds/build/plan.hpp>
+#include <dds/build/plan/full.hpp>
 
 #include <range/v3/view/concat.hpp>
 #include <range/v3/view/filter.hpp>

src/dds/build/plan.hpp

-#pragma once
-
-#include <dds/build/params.hpp>
-#include <dds/build/plan/archive.hpp>
-#include <dds/build/plan/compile_file.hpp>
-#include <dds/build/plan/exe.hpp>
-#include <dds/build/plan/library.hpp>
-#include <dds/build/plan/package.hpp>
-#include <dds/library.hpp>
-
-namespace dds {
-
-class build_plan {
-    std::vector<package_plan> _packages;
-
-public:
-    package_plan& add_package(package_plan p) noexcept {
-        return _packages.emplace_back(std::move(p));
-    }
-    auto& packages() const noexcept { return _packages; }
-    void  compile_all(const build_env& env, int njobs) const;
-    void  archive_all(const build_env& env, int njobs) const;
-    void  link_all(const build_env& env, int njobs) const;
-};
-
-}  // namespace dds

src/dds/build/plan.cpp → src/dds/build/plan/full.cpp

-#include "./plan.hpp"
+#include "./full.hpp"
 
 #include <dds/build/iter_compilations.hpp>
 #include <dds/proc.hpp>

src/dds/build/plan/full.hpp

 #pragma once
 
-#include <build/plan/package.hpp>
-
-#include <map>
+#include <dds/build/params.hpp>
+#include <dds/build/plan/archive.hpp>
+#include <dds/build/plan/compile_file.hpp>
+#include <dds/build/plan/exe.hpp>
+#include <dds/build/plan/library.hpp>
+#include <dds/build/plan/package.hpp>
+#include <dds/library.hpp>
 
 namespace dds {
 
-class build_plan2 {};
+class build_plan {
+    std::vector<package_plan> _packages;
+
+public:
+    package_plan& add_package(package_plan p) noexcept {
+        return _packages.emplace_back(std::move(p));
+    }
+    auto& packages() const noexcept { return _packages; }
+    void  compile_all(const build_env& env, int njobs) const;
+    void  archive_all(const build_env& env, int njobs) const;
+    void  link_all(const build_env& env, int njobs) const;
+};
 
-}  // namespace dds
+}  // namespace dds

src/dds/compdb.hpp

 #pragma once
 
-#include <dds/build/plan.hpp>
+#include <dds/build/plan/full.hpp>
 
 namespace dds {
 

src/dds/ddslim.main.cpp

 #include <dds/build.hpp>
-#include <dds/build/plan.hpp>
 #include <dds/logging.hpp>
 #include <dds/repo/repo.hpp>
 #include <dds/sdist.hpp>

src/dds/deps.hpp

 #pragma once
 
-#include <dds/build/plan.hpp>
+#include <dds/build/plan/full.hpp>
 
 #include <semver/version.hpp>