Xibless

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* Fix ``Menu.removeItem()`` bug resulting in un-compilable code generation.
* Fix compilation warnings with identifier-less ``TabViewItem``.

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* Fixed a crash with UI scripts containing non-ascii text

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* Added VHLayout.
* Added Box.
* In View, added delegate, fixedHeight, fixedWidth and accessibilityDescription attributes as well
as moveTo() (a more powerful version of packToCorner()) and fillAll() methods.
* In Segment, added image and accessibilityDescription attributes.
* Added SplitView.dividerStyle and added documentation for a direct split view hierarchy.
* Added TableView.borderType and View.focusRingType.
* Added Button.bordered
* Added MenuItem.state
* Added TabView.tabViewType.
* Added TextField.usesSingleLineMode.
* Added margin and align arguments to layouts.
* Deprecated View.packToCorner().
* Layouts can now contain sublayouts.
* Allow Color() to receive values in the range of 0-255 in addition to 0.0-1.0.
* Don't localize strings containing only "-" (they're used to indicate a separator menu item).
* RadioButtons' height now depends on the number of rows it has.
* Fixed filler resizing in layouts in cases where there are other views next to the filler.
* Allow UI scripts to import units that are from the same folder.
* Replaced Button.keyEquivalent with Button.shortcut.
* Fixed runtemplate so that the XiblessSupport unit is compiled in the RunUI executable.
* Fixed a bug where we would sometimes end up with two generated item with the same varname.
* Always set growX/growY to False in setAnchor() for views that have a fixed width/height.
* The "text" argument of TextField's constructor is now optional.
* Support sides and middle in View.setAnchor().
* Generated units now have a comment indicating generation time and xibless version.
* Moved TextField.alignment down to Control
* Only copy XiblessSupport unit when it changed, thus avoiding needless recompilation.
* Fixed TabView's layout deltas for cases where there's no tabs.
* Support shortcuts involving the '+' character.
* Improved default margins in layouts, control heights and all other little tweaks of this sort.

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* Added NLSTR to UI scripts namespace.
* Don't wrap Window.autosaveName in localization calls.
* Fixed a bug causing some strings not to be wrapped in localization calls.
* Set RadioButton's "autosizesCells" to True upon creation.

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* Added Panel, SplitView, OutlineView, ListView, Toolbar, SegmentedControl, SearchField, Slider
and NumberFormatter.
* Added Layouts.
* Added support for many, many, many new attributes, constants and types.
* Now generates a ".h" to go alongside the generated unit.
* Added Property and its subclasses, an easier way to add support for new attributes, even the
complex ones.
* It's now possible to override margins in layout method calls.
* Added support for bindings with the new ``View.bind()`` method.
* Added the new ``defaults`` global variable, which can be used to bind to user defaults.
* Constants accessed with ``const`` can now be bitwise OR-ed.
* Generated code is now formatted to look a bit better and be easier to debug.
* Added new constants for menu shortcuts for special keys (arrows, enter etc.).
* Added support for UI script arguments.

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* Pushed down the `action` attribute from `Button` to `Control`.
* `RadioButtons` is now a `Control` subclass.
* Made window recalculate its view loop after having generated its children.