Fix #2508283 (Improper wrapping of long text in ics attachments)

* Ignore CR and change LF into backslash + n
* Write unit test for handling of CRLF's
* Rename mLineCount to mColumnCount, which is more appropriate

Bug: 2508283
Change-Id: I8b2081aa474cb07b6cb09383ff6ac58a1dab1bba
2 files changed