Pyslvs

+ Rename "Coordinate" to "Coord"(keep old name).
+ Add "sx" & "sy" properties for VPoint slot coordinate.
+ Add "link_pos" and "points_pos" methods for VPoint and VLink respectively.
+ Add "to_coord" method for VPoint objects.
+ Reduce unused code of Sketch Solve and redesign its API.
+ Add PPP function to solve parallel linkage.
+ Rename the module "topo_config".

+ Support MSVC versions `1910`~`1916` and `1920`~`1926`.
+ Derivation will treat a path as a full stroke if difference is not the maximum.
+ Add function "PALP".

+ Remove "return none" annotation from stubs.
+ A shell version of "set_pycompiler".
+ Support incomplete path works with derivative function.

+ Fix the bug of topological algorithm.
+ Add `curvature`, `derivative` and `path_signature` functions.

+ Allow case insensitive color name.
+ Merge `altas` and `number` module as `structural`.
+ Rename `planar_check` module to `graph_planar`.
+ Add ordered simples option of planar linkage synthesis.
+ Change several variable names of backend.
+ Move graph related modules into `pyslvs.graph` package.
+ New graph searching method for polygon link.
+ Change triangular symbol "A" to "I" (input).
+ Add symbol "A" (angle of polygon link).

+ Change example list and collection list as a function.
+ Add an iterator for grabbing examples and collections names.
+ Function name typo corrections.
+ Add "get_include" function for setup.
+ "Shape only" synthesis mode.
+ DWT synthesis mode. (alpha)