Battery: major code refactoring

ditto

src/modules/battery/option.h

@@ -0,0 +1,17 @@
+#pragma once
+
+// This file will be included in "fastfetch.h", do NOT put unnecessary things here
+
+#include "common/option.h"
+
+typedef struct FFBatteryOptions
+{
+    const char* moduleName;
+    FFModuleArgs moduleArgs;
+
+    bool temp;
+
+    #ifdef __linux__
+        FFstrbuf dir;
+    #endif
+} FFBatteryOptions;