Add some useful functions to Panic::ERROR.

These are accessor functions I thought were in Panic::ERROR already.
It turns out they were not, so let's add them.

Functions added by this commit:

	- Panic::ERROR::get_current_log_line().

 	- Panic::ERROR::get_max_log_lines().

	- Panic::ERROR::get_log_level().

	- Panic::ERROR::get_log_file_path().

	- Panic::ERROR::is_logging_enabled().