Sort travelnets and elevators when copying

[S-S-X]

• Fixed probable bug (not yet happened): copying unconfigured travelnet would crash server. Also less probable bug if network data is corrupted. This might still leave possible crash scenario when elevators and travelnets are mixed in same network (not intended but possible).
• Added sorting for copied networks either by height or set position (timestamp).

[github-actions[bot]]

Click for detailed source code test coverage report

### Test coverage report for Metatool API sources: ``` File Hits Missed Coverage ----------------------------------------------------- api.lua 159 87 64.63% command.lua 4 43 8.51% formspec.lua 0 156 0.00% init.lua 0 8 0.00% settings.lua 83 9 90.22% util.lua 37 13 74.00% ``` ### Test coverage report for Containertool sources: ``` File Hits Missed Coverage ----------------------------------------------------- init.lua 56 10 84.85% nodes/common_defaults.lua 33 14 70.21% nodes/digilines_chest.lua 11 7 61.11% nodes/more_chests_shared.lua 10 4 71.43% nodes/technic_chests.lua 61 19 76.25% nodes/technic_injector.lua 23 5 82.14% ``` ### Test coverage report for Sharetool sources: ``` File Hits Missed Coverage ----------------------------------------------------- init.lua 25 66 27.47% nodes/any.lua 25 87 22.32% nodes/book.lua 23 15 60.53% nodes/digiline_global_memory.lua 10 15 40.00% nodes/mapserver.lua 17 15 53.12% nodes/missions.lua 10 15 40.00% nodes/travelnet.lua 34 165 17.09% ```