Extended Support for Typing in the Symbolic Toolbox

See merge request !443

 - Add the `sqrt` function to the IR, as well as to CPU, CUDA, SYCL, and x86-vector targets
 - Rewrite case for `sp.Power` in freeze to generate `sqrt` calls where appropriate
 - Adapt function test suite: Test on values within the correct domain for all functions
 - Untrack some testsuite output files
 - Remove some deprecated imports from the testsuite

Refactor Configuration API

See merge request !442

Various extensions to the vectorizer

See merge request !439

Introduce Nox for Local and CI Test Automation. Start Writing a Contributors Guide.

See merge request !436

Expose method to retrieve the original name of a duplicated symbol

See merge request !440

Fix canonicalization of >2 loops with the same counter

See merge request !435

Don't import from deprecated pystencils.kernelcreation

See merge request !434

Consolidate codegen and JIT modules.

See merge request !433

fix memory layout descriptor parsing (v2.0-dev edition)

See merge request !432

Jupyter Inspection Framework, Book Theme, and Initial Drafts for Codegen Reference Guides

See merge request !430

Iteration Slices: Extended GPU support + bugfixes

See merge request !429

Refactor and Improve Documentation

See merge request !425

Vectorization in Default Kernel Creation Driver

See merge request !428

Fixes to Constant Elimination Pass

See merge request !427

Refactor DEFAULTS & fix bugs concerning data types of spatial counter symbols

See merge request !426

Vectorization: Infrastructure and Base Implementation for x86

See merge request !424

Migrate Test Suite

See merge request !409

fix usage of kernel parameter API in boundary handling

See merge request !423