Vfxwindow

- Added `dialog` launch option to work with all programs.
- Renamed `dialog` to `isDialog`.
- Deprecated use of `pm.layoutDialog` in Maya.
- Remember signal connection types when pausing.
- Improve saving window positions.
- Remove exception if Nuke window is not available.

- Removed `Qt.py` from source and added as dependency
- Automatically generate an "About" dialog
- Improved signal pausing
- Fixed typo in Blender callbacks
- Fixed bugs in Nuke docked window
- Get main Fusion window

- Added support for launching a GUI in Fusion.
- Reworked import checks to be more efficient.
- Add `QMenuBar` override so it works in docked Maya windows.
- Applied `setVisible` override to all windows.
- Renamed `isChildWindow` to `isInstance`, since it checks if the window was launched with the `instance` method.

Added support for launching a GUI in Substance Designer.

Some general fixes were done along with improvements to the Nuke and Maya windows.

Added support for launching a GUI in 3DS Max.

Improved the Maya window to allow launching in standalone mode.

The way Nuke deals with dockable windows is not pythonic at all. It requires the window to exist in `globals()`, and only accepts a string input, so I originally required a `namespace` argument to be passed to `NukeWindow.show`.

There's now a function that will recursively search through all the modules to find where the window was imported. If it can't be found, then it'll not dock the window, as it'll only cause errors.