Ignore comments in multiline strings

[vinivendra]

Comments that are inside multiline strings (as a part of the string itself) are being treated as normal code comments and are being duplicated as comment nodes. For example:

// gryphon multiline
let a = """

// blabla

"""

...is translated as...

// gryphon multiline
internal val a: String = """
// blabla
"""

// blabla

Note the // blabla comment at the end of the Kotlin translation that shouldn't be there.

This only seems so happen when Gryphon is invoked with --no-main-file, since the comment handling for main files is different.