Macimg

**Additions**
- Added image generators
- _CheckerboardGenerator_
- _RandomGenerator_
- _StripesGenerator_
- _TextImageGenerator_
- _RoundedRectangleGenerator_

**Bug Fixes/Changes**
- Fixed Crop transformation use None instead of (0, 0) as the bottom-left origin of the image crop.
- Fix colors having incorrect blue value

**Additions**
- Added 20 new filters:
- BoxBlur
- DiscBlur
- Median
- MotionBlur
- ZoomBlur
- XRay
- Thermal
- Tonal
- Transfer
- Process
- Mono
- Noir
- Instant
- Fade
- Chrome
- HexagonalPixellate
- Gloom
- EdgeWork
- LineOverlay
- BokehBlur

**Bug Fixes/Changes**
- Made _Image.crop()_ into a _Transform_ object, in line with other transformations.
- Fixed _Image.pad()_ referencing a nonexistent attribute carried over from PyXA.
- Fixed _Image.overlay_image()_ returning an NSImage instead of a wrapped Image object.
- Fixed _Image.image_from_text()_ referencing a nonexistent attribute carried over from PyXA.
- Fixed attribute error when initializing _Color_ with no arguments.

**Deprecations**
- None

**Removals**
- _Color.copy_color()_ — This method was redundant. Initialize _Color_ with another Color object as an argument to copy RGBA values.

Initial pre-release