添加配置类以加载默认字体设置，并更新字体替换逻辑

config.cpp

@@ -0,0 +1,48 @@
+#include "config.hpp"
+#include "fileop.h"
+#include "file_reader.h"
+#include "malloc.h"
+
+#include <fcntl.h>
+#if _WIN32
+#include <Windows.h>
+#endif
+
+bool Config::Load(std::string path) {
+    if (!fileop::exists(path)) {
+        return false;
+    }
+    int fd = 0;
+    int err = fileop::open(path, fd, O_RDONLY, _SH_DENYRW, _S_IREAD);
+    if (err < 0) {
+        return false;
+    }
+    FILE* f = fileop::fdopen(fd, "rb");
+    if (!f) {
+        fileop::close(fd);
+        return false;
+    }
+    auto reader = create_file_reader(f, 0);
+    char* line = nullptr;
+    size_t line_size = 0;
+    while (!file_reader_read_line(reader, &line, &line_size)) {
+        std::string l(line, line_size);
+        free(line);
+        line = nullptr;
+        line_size = 0;
+        size_t comment_pos = l.find_first_of('#');
+        if (comment_pos != std::string::npos) {
+            l = l.substr(0, comment_pos);
+        }
+        size_t eq_pos = l.find_first_of('=');
+        if (eq_pos == std::string::npos) {
+            continue;
+        }
+        std::string key = l.substr(0, eq_pos);
+        std::string value = l.substr(eq_pos + 1);
+        configs[key] = value;
+    }
+    free_file_reader(reader);
+    fileop::fclose(f);
+    return true;
+}