compile with XCode 5.0

* compile with LLVM 5.0
* update runpath to @executable_path/../Frameworks to PSMTabBarControl
  can be found by dyld
* update to latest PSMTabBarControl.framework
* use ARC
* convert to modern objective-C
* disable Growl
refactor code

* use "." syntax to access instance properties
* kill more `deprecated` warnings
ignore dead key event

* do not crash on a dead key event
disable RSS feed by default
use WLIntegerArray for csBuf and csArg in WLTerminalFeeder

* more refactor
reimplement the QuickLook support of downloaded items

* use public QuickLook API only
minor refactor of coding style
update DBPrefsWindowController to the version by kgn
reformat WLTermView.m

* add some comments
* use NSDictionary for attributes cache
replace deprecated API using CoreText