Improve function prototype, helping analysis.

Settings.c

@@ -61,7 +61,7 @@ static void Settings_readMeterModes(Settings* this, char* line, HeaderSide side)
    String_freeArray(ids);
 }
 
-static bool Settings_read(Settings* this, char* fileName, int cpuCount) {
+static bool Settings_read(Settings* this, const char* fileName, int cpuCount) {
    FILE* fd = fopen(fileName, "r");
    if (!fd)
       return false;