AutoIt syntax support

[iulianOnofrei (U-lee-aan)]

AutoIt (*.au3) syntax support would be nice, but the UTI looks very weird:

kMDItemContentType     = "dyn.ah62d4rv4ge80c7mx"
kMDItemContentTypeTree = (
    "public.item",
    "dyn.ah62d4rv4ge80c7mx",
    "public.data"
)

Also, in the app, 2 different entries are shown:

[sbarex]

Added support on release 2.1.18.