TFE fails to find some files (json) when launched outside the build directory on Linux

[Ettotsu]

It seems like tfe won't find some necessary files when launched outside the build directory, for example in a window manager with *.desktop or from a terminal by typing theforceengine. ExternalData/*.json files seem to be the problematic ones

For example, in-game gun projectiles won't work.

Here are some extracts from the logs (first one might be normal, though the second one is more of an issue):

2024-Dec-22 22:18:46 - [Error : HUD] Cannot load font 'AmoNum2.fnt'
2024-Dec-22 22:18:46 - [Error : HUD] Cannot load font 'SuperWp2.fnt'
2024-Dec-22 22:18:46 - [Error : HUD] Cannot load font 'ArmNum2.fnt'
2024-Dec-22 22:18:46 - [Error : HUD] Cannot load font 'HelNum2.fnt'

2024-Dec-22 22:18:46 - [LOGICS] Parsing logic JSON(s)
2024-Dec-22 22:18:46 - [EXTERNAL_DATA] Loading pickup data
2024-Dec-22 22:18:46 - [EXTERNAL_DATA] Loading projectile data
2024-Dec-22 22:18:46 - [Error : EXTERNAL_DATA] Warning: Projectile data is incomplete. PROJECTILES.JSON may have been altered. Projectiles may not behave as expected.
2024-Dec-22 22:18:46 - [EXTERNAL_DATA] Loading effects data
2024-Dec-22 22:18:46 - [Error : EXTERNAL_DATA] Warning: Effect data is incomplete. EFFECTS.JSON may have been altered. Effects may not behave as expected.
2024-Dec-22 22:18:46 - [MemoryRegion] Allocated new memory block in region 'Landru' - new size is 1 blocks, total size is '4194304'
2024-Dec-22 22:18:46 - [MemoryRegion] Allocated new memory block in region 'Cutscene' - new size is 1 blocks, total size is '8388608'
2024-Dec-22 22:18:51 - [Player] Setting up level 'SECBASE'
2024-Dec-22 22:18:51 - [Error : Dark Forces Game Script] LevelScript.fs (0, 0) : Failed to open script file 'LevelScript.fs'
2024-Dec-22 22:18:51 - [Warning : level_loadGeometry] Could not open 'ZWIMP10L.BM', using 'default.bm' instead.
2024-Dec-22 22:18:51 - [Warning : level_loadGeometry] Could not open 'ZWIMP11.BM', using 'default.bm' instead.
2024-Dec-22 22:18:51 - [Warning : level_loadINF] Hit the end of INF 'SECBASE' before parsing all items: 58/60