Updated to version macSVG 1.2

Update build architectures for X86_64 and Apple Silicon.

Fix date in release notes.

Update release notes.

This commit fixes some bugs in StyleAttributesEditor and AnimationPathsPopoverViewController.

This commit fixes a bug in path drawing for the Close Path and Continue command. It allows a new subpath to be started at a new coordinate after the path is closed. It is particularly useful with the 'fill-rule' attribute for the path element, for example: to define holes inside a closed path.

This commit fixes some bugs, mainly for path segments for the 'm' relative move command.

This commit fixes some bugs in the GradientEditorPopoverViewController, mainly when a gradient is edited after the initial setting.

This commit increments the macSVG version number to 1.7.7.

This commit fixes some bugs in the Paste command for the XML outline view. The new method uses the selected elements in the outline, the state of the expansion controls, and the DTD to determine the best placement of the pasted elements.

In NSOutlineView_Extensions mouseDown method, if user clicks on a row that is already selected, skip the call to deselectAll:. This fixes the problem with drag-and-drop for multiple items in the XML Outline View.

This commit fixes some bugs in the previous commit concerning the Paste function in the XML outline view.

Implement Cut/Copy/Paste functions for SVG elements in XMLOutlineView. The implementation will try to validate the paste insertion into the selected element as child elements if the selected item is expanded - if not valid, or the selected item is not expanded, the pasted elements will be inserted after the selected item. Some bugs probably remain, but it mostly seems to be working,

This commit fixes some bugs in the Path Segment Editor popover. Also, a few variable names were changed, and some old code was removed.

This commit adds a new PathSegment object to replace the use of a NSDictionary for path editing functions.