Add basic logging functionality

src/os/file/file.h

@@ -34,9 +34,18 @@ typedef enum {
 	FILE_SEEK_ORIGIN_COUNT,
 } FileSeekOrigin;
 
+// Return value should not be cached as it's not guaranteed to remain the same. Always call
+// wapp_file_stdin to get the standard input stream
 wapp_extern WFile *wapp_file_stdin(void);
+
+// Return value should not be cached as it's not guaranteed to remain the same. Always call
+// wapp_file_stdout to get the standard output stream
 wapp_extern WFile *wapp_file_stdout(void);
+
+// Return value should not be cached as it's not guaranteed to remain the same. Always call
+// wapp_file_stderr to get the standard error stream
 wapp_extern WFile *wapp_file_stderr(void);
+
 WFile *wapp_file_open(const Allocator *allocator, Str8RO *filepath, FileAccessMode mode);
 i64    wapp_file_get_current_position(WFile *file);
 i64    wapp_file_seek(WFile *file, i64 offset, FileSeekOrigin origin);