New Spriter 2 Alpha build with various bug fixes

[h2]0.6.1.0[/h2]

Bug Fixes

Fixed a bug where children of stroke would shift angles when moved or redrawn outside of rigging mode.
Fixed a bug where children of strokes would shift angles after bring dragged and dropped when in rigging mode.
Fixed a bug where adding a mesh to a bone after adding the bone to the stroke would break the hierarchy and cause unpredictable behavior.
Fixed a bug where in certain edge cases, children of strokes would have their local positions calculated extremely inaccurately, causing unpredictable behavior.
Fixed a bug where having a mix of bone with stroke children and strokes with bone children would cause edits in one part of the rig to affect other parts of the rig.
Fixed a bug where in certain edge cases stroke children could have their inverse positions permanently stuck at the wrong value, causing undesirable behavior.
Fixed a bug where attempting to redraw a stroke while hovering another another object would cause that object to get selected and dragged instead.

Known Issues

Meshes above a certain number of verts cause pin deformer to fail and leave the program in an unstable state
Undo and Redo don't always function correctly with the new features
Changes to z-order in rigging mode not reflected in animation
Occasional visual glitches while editing animations
Save and Load not working reliably in all situations
Images saved from certain image editors will acquire artifacts when they have antialiased edges where the alpha isn't fully opaque or transparent. These issues aren't exclusive to Spriter 2 and will affect any game engine that doesn't preprocess them. These pre-processing functions will be introduced in a future version, and can be ignored for now.
When changing curvature of a ligament with real-time preview in Rig Preview Mode, display temporarily changes to whatever image is set as default in the rig
It's possible to make an object the child of multiple other objects causing unpredictable behavior.