Update TTPreInfo class to use TimetableReader parser

Registered by James Ross

The current code in ORTS.Formats.TTPreInfo uses direct file reading and parsing to process what is a Timetable-format file. It should be using the standard TimetableReader, because it scans through the file in exactly the same manner (line by line, column by column).

Blueprint information

Status:
Not started
Approver:
cjakeman
Priority:
Medium
Drafter:
James Ross
Direction:
Approved
Assignee:
None
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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