Pyslvs-ui

**Features**:

+ Fix canvas selection and display error.
+ Generate calculation script after parser script. (35)
+ Support parallel linkage. (36)
+ Skip auto preview paths when saving file.
+ Implement plotting function for slider paths.
+ Implement final vector animation.
+ Remove wavelet function.
+ Add extra curve fitting function powered by SciPy.
+ Some corrections of the main canvas.

**Development**:

+ Extra SciPy requirement.
+ Remove unessential `__all__` list.

**Features**:

+ Polar plotting function and joint viewer.
+ Animation function for the paths of inputs page.
+ "Append path" function for the path of dimensional synthesis page.
+ Remove deprecated "show solutions" buttons.
+ Fix GUI crash on AppImage. (34)

**Development**:

+ Support MSVC versions `1910`~`1916` and `1920`~`1926`.
+ Improvement of UI and QRC file generating.
+ Annotated object attributes are placed in class definition uniformly instead of method blocks.
+ Use immutable "Mapping" replace "Dict" when no need to change the content.

**Features**:

+ Remove context menu of record list. The functions replaced with buttons.
+ Support incomplete path works with derivative function.

**Development**:

+ Make "python-solvespace" as an extra requirement.
+ Remove "return none" annotation from all typing.

**Features**:

+ Fix relocate function and increase accuracy of its spinbox.
+ The zoom bar has been isolated.
+ Add grid mode toggle button at the main window.
+ Remove not useful functions.
+ Add "report issue" action on the main menubar.
+ UI improvement for "inputs" page.

**Development**:

+ Use Matplotlib instead of PyQtChart.
+ Fix the error of auto preview path.
+ Fix the bug of topological algorithm. (33)

**Features**:

+ Dimensional synthesis result preview:
+ Add path comparison page.
+ Support monochrome mode.
+ Change color of target path.
+ More clearer command line interface.
+ Fix incorrect "new link" conditions.
+ Add ordered simples option of planar linkage synthesis.

**Development**:

+ New graph searching method for polygon link from kernel.
+ Remove docstring gap between class definition.
+ Remove one instance limit.

**Features**:

+ Fix file loader error during loading algorithm results.
+ Fix the touching area of target point moving.
+ Improve load target path function.
+ "Shape only" synthesis mode.
+ DWT synthesis mode. (alpha)

**Development**:

+ Renamed enum constant as uppercase.
+ Change Makefile command name:
+ For package: suffix `pack`.
+ `build` change to `pack`
+ `clean` change to `clean-pack`
+ `test` change to `test-pack`
+ For kernel: no suffix.
+ `build-kernel` change to `build`
+ `clean-kernel` change to `clean`
+ `test-kernel` change to `test`
+ The default command `all` change to `build` only.
Use `make test-pack` instead of `make`.
+ Rewrite and fix file loader.
+ Use "apimd" module to generate the API doc.
+ New Makefile command "doc".