[Core][File name][Win only]: Name a new file with dots created 2 files

[Zhuyun]

Steps:

1. Launch Brackets.
2. New a file with dots in its name, for example: untitled-2......
3. Observe the project tree

Result:
2 files are created, one named 'untitled-2' and another is 'untitled-2......'

Expected:
Only one file with name 'untitled-2' should be created as the Win OS behaves this way

ENV: Windows English OS
Build: 0.38.0-12173

Note:

1. If rename an existing file with dots, dots wouldn't be added, which is correct.
2. On MacOSX, file name with dots is acceptable by system and Brackets.

Snapshots:
Please refer to snapshots for details:

[Zhuyun]

Found this issue when regress #5468

[RaymondLim]

This is the result of Windows OS automatically trimming all the dots from the filename if it does not have a valid character after the last dot. (You can see this by renaming a file that ends with multiple dots in Windows Explorer.) Then our new File Watcher triggers an external file rename in Brackets and causing two files in the side bar. Before the File Watcher landed in master we're showing a non-existing filename in Brackets until next session of Brackets.

[pthiess]

@JeffryBooher

[JeffryBooher]

Closing @Zhuyun let us know if you still see a problem.

[Zhuyun]

Verified in latest build 41.13190, confirm fixed.