TR1-3 Fixes and Improvements

[lahm86]

#353 TR1 Secret Randomization

• Update to TRGE to resolve an issue where TombATI levels always had 0 secrets defined against them, so secret randomization had no work to do effectively.
• Two more secret locations added to Valley.

#404 Wireframe Triggers

A new option is now available in wireframe mode to highlight pad and heavy triggers to retain floor texture hints that would otherwise be lost. Closes #404.