Converted project to ARC
[CHANGE] fixed issue with hardcoded height of control of 22 pixels, because we need to be flexible and have 24 points
[FIX] made signedness aware, more checks on NSNotFound where necessary. fixing crash.

Conflicts:

	Source/PSMTabDragAssistant.m
[CHANGE] selecting a tab from overflow popup just inserts the selected tab at last visible index, this should behave more like the OS does.

Conflicts:

	Source/PSMTabBarControl.m
[FIX] wrong layout of tabs while dragging a tab out of a window. placeholders should be removed just with index methods because the are added this away and are not observed at any time.
[FIX] correctly assign PSMTabState masks and relayout TabView if tab gets selected.
[FIX] make sure overflow button position is calculated from the current cell position. stabilizes position while live resizing window.
Fixed typo in respondToSelector. Now it’s the same selector that it checks for, as the selector that it executes.
Eliminated warning about “Gestalt” being deprecated
Install the framework into Frameworks in the package
Add TexturedMetal tab style

Based on https://github.com/zachwaugh/PSMTabBarControl's later work.
Unified tab style : darker background for unselected tabs
Unified tab style : more visible vertical separation for non active tabs.