Introduced a sample directory and moved all non-library-components from src to there

samples/ctest/CMakeLists.txt

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+##############################################
+##  CMakeLists.txt for the C API test       ##
+##############################################
+
+set(CMAKE_C_STANDARD 11)
+set(CMAKE_C_STANDARD_REQUIRED ON)
+
+add_executable(ctest main.c)
+target_link_libraries(ctest PRIVATE astaroth_core astaroth_utils)

samples/ctest/README.txt

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+This directory is used to test whether the Astaroth API is compatible with C.

samples/ctest/main.c

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+/*
+    Copyright (C) 2014-2020, Johannes Pekkila, Miikka Vaisala.
+
+    This file is part of Astaroth.
+
+    Astaroth is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    Astaroth is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with Astaroth.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "astaroth.h"
+
+// From Astaroth Utils
+#include "src/utils/config_loader.h"
+#include "src/utils/memory.h"
+#include "src/utils/verification.h"
+
+int
+main(void)
+{
+    AcMeshInfo info;
+    acLoadConfig(AC_DEFAULT_CONFIG, &info);
+
+    // Alloc
+    AcMesh model, candidate;
+    acMeshCreate(info, &model);
+    acMeshCreate(info, &candidate);
+
+    // Init
+    acMeshRandomize(&model);
+    acMeshApplyPeriodicBounds(&model);
+
+    // TODO load to candidate
+    ////////////////////////////////////////////////////////////////////////////////////////////////
+    acInit(info);
+    acLoad(model);
+    acStore(&candidate);
+    acQuit();
+    ////////////////////////////////////////////////////////////////////////////////////////////////
+
+    // Verify and destroy
+    acVerifyMesh(model, candidate);
+    acMeshDestroy(&model);
+    acMeshDestroy(&candidate);
+
+    return EXIT_SUCCESS;
+}