Set C standard to C11 and add new assets

Changed CMakeLists.txt to set the C standard to C11.
Added multiple binary image files for new visual assets.
Added several new image files to enhance rendering capabilities.
Changed stb_image.h to improve support for various image formats.
Changed ray tracing engine to enhance ray creation and intersection.
Changed triangle structure to use a vertex array for better attribute handling.
Changed scene initialization to accommodate new texture management.

header/Common/String.h

@@ -0,0 +1,77 @@
+#ifndef STRING_H
+#define STRING_H
+
+#include <ctype.h>
+#include <string.h>
+
+static inline bool is_absolute_path(const char* path)
+{
+    if (!path || !*path) return false;
+
+#ifdef _WIN32
+    // 1) Drive-letter paths: "C:\…", "D:/…"
+    if (isalpha((unsigned char)path[0]) &&
+        path[1] == ':' &&
+       (path[2] == '\\' || path[2] == '/'))
+    {
+        return true;
+    }
+
+    // 2) UNC paths: "\\server\share\…"
+    if (path[0] == '\\' && path[1] == '\\')
+    {
+        return true;
+    }
+    return false;
+#else
+    // POSIX: anything starting with '/'
+    return path[0] == '/';
+#endif
+}
+
+static inline void get_path_directory(const char* path, char* out, size_t out_size)
+{
+    if (path == NULL || out == NULL || out_size == 0)
+    {
+        if (out && out_size > 0)
+        {
+            out[0] = '\0'; // ensure output is empty on invalid input
+        }
+        return;
+    }
+
+    const char* last_slash = strrchr(path, '/');
+
+    if (!last_slash)
+    {
+        if (out_size > 0)
+            out[0] = '\0';
+        return;
+    }
+
+    size_t dir_len = (size_t)(last_slash - path);
+
+    if (dir_len >= out_size)
+    {
+        dir_len = out_size - 1;
+    }
+
+    memcpy(out, path, dir_len);
+    out[dir_len] = '/';
+    out[dir_len + 1] = '\0';
+}
+
+static inline void string_join(const char* a, const char* b, char* out, size_t out_size)
+{
+    if (a == NULL || b == NULL || out == NULL || out_size == 0) return;
+
+    size_t a_len = strlen(a);
+    size_t b_len = strlen(b);
+
+    if (a_len + b_len + 1 >= out_size) return; // +1 for null terminator
+
+    strcpy(out, a);
+    strcat(out, b);
+}
+
+#endif // STRING_H