Add support for converting SPUIs to ArgScript #106
Description
In the legacy Sporemodder, SPUI files could be converted to .spui.spui_t.
Although the raw SPUI format can be edited, SPUI_T has the advantage of being human-readable.
It's possible to modify an SPUI_T file without the graphical editor if needed, which is useful when an element type (e.g outlined text captions) is not fully supported in SMFX yet.
Converting to a more human-readable format would also allow for other tools to be more easily made that can handle SPUI files, as Sporemodder FX's current SPUI editor can be rough around the edges in some cases.
Ideally, a different format with support for nested objects could be used, such as JSON - but, even if it is just an ArgScript format, this would still be a huge improvement as mentioned above.