Support for trle custom level.

[Damocle92]

Thank you for the awesome work.
Old version of tomb1main play nice with trle levels like Nordic-adventure, Sabatu-Tr1 ecc.
On recent version of TR1X some custom level are crashing on load, i wonder why and if is possible to fix or have some compatibility options for old custom levels.
For example i cannot start the second level of Feder-oasis, i attach the log.
TR1X.log

[lahm86]

Thanks for reporting this @Damocle92. I've raised an issue to investigate this - #2114.

[aredfan]

Fixed by Lahm in #2120.

Edit: You can try out the fix in the latest Development snapshot.