(Sailfish) Change package name to 'harbour-quickddit'

As required by Jolla Harbour (https://harbour.jolla.com/faq)
Improve handling of relative url

Change QMLUtils::getRedditFullUrl() to toAbsoluteUrl(), relative url
that is not starts with '/' will consider as an invalid url and will not
trigger any action when clicked.
Improve show parent function for comments

* Show parent when the CommentMenu is destructing instead of on
clicked so that the CommentMenu can be close/destroy properly
* Highlight the parent comment when shown
* Will no longer position the parent comment to top if the comment is
within view
* Enable show parent function for Sailfish version
Use mobile friendly version of authorization page

See <http://redd.it/1un00d> for more info
Retrive and store reddit username after acquired access token
New feature: Add/reply comment
Make deleted comments in disabled state
Improve SubredditDialog and SearchDialog

* (Harmattan) Disable accept button when input is not valid
* Disable auto upper case and predictive text for subreddit text field
* Add validator for subreddit text field
* (Sailfish) Add PullDownMenu in SubredditDialog for refresh subscribed
subreddits
* Add load more button for subscribed subreddits list view
(Sailfish) Replace all "Load more" button with PushUpMenu
Store raw markdown text for LinkObject and CommentObject (for comment editing)
New feature: edit/delete comment
Update app description
Add license header to all source file
Bump version to 0.2.0