The Edge Slide code was practically redone to correct errors and to
enable this operator to become a generic transform operator.
The errors are;
1. Unpredictable slide direction when the vertex "slides" over multiple
edges.
2. Incorrect direction when the sliding edge has disconnected faces.
The fixes were:
- When the sliding direction splits into multiple directions, the
chosen target is now the intersection of the destination edge lines
(instead of the average point or a randon point)
- If the edge faces disconnect, the vertex slides in different
directions on each face.
Other changes:
- Use C++ for Array e Vector types.
- Create methods to access or edit struct parameters.
- Use `TransData` to access the initial position of the vertex.
- Acess slide vertice by reference.
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