Dilato: Core: Brackets still not support other encodings

[Zhanxin]

Steps:

1. Launch Beackets
2. Try to open other encoding files other than UTF-8, tried with Unicode and UTF-16

Result: I always get an error that Brackets only support UTF-8 files
Expect: The files could be opened and edit
aaa.txt

[petetnt]

Encoding support is WIP in #13412

[Zhanxin]

Tried again with build 1.10.0-17455 21, still could reproduce this issue. When open a unicode file, I would get an error message that the file is not support.
I also tried a file with encoding Chinese GB2312, the file could be opened, but the Chinese characters can't be displayed on the Brackets:

Testing file:
Unicode:
aaa.txt
GB2312:
new 1.txt

[Zhanxin]

This issue still available, if open a utf-16 LE or utf-16 BE file, the brackets would display nothing.
Attached files:
utf-be:
bcd.txt
utf-le:
abc.txt

[saurabh95]

We are not currently supporting files with BOM characters (UTF-16 LE and UTF-16BE)

[ZuoBaogang]

Retest this issue with build 1.10.0-17313, UTF-16 has been removed form the encoding list. The error message is reasonable if open an UTF-16 file.

Close as fixed.