Suggestion: support importing tileset in text format .tres, scenes in text format .tres

[hsandt]

I often see diff in VCS on tileset.res and imported LDtk scene.scn but due to binary format it's hard for me to tell what really changed.

It would be nice to have a checkbox in LDtk import settings to:

• Import tileset as text (.tres)
• Import scenes as text (.tscn)

for easier diff (in exchange for bigger files, but debugging is what matters most for me during development)