Xtrack version 0.37.0

Changes:

• Introduce the following thick elements: Bend, Quadrupole, CombinedFunctionMagnet.
• Introduce Line.slice_thick_elements method, equivalent to MAD-X makethin.
• Introduce time-dependent functions within xdeps variables, which are changed automatically during tracking.
• Introduce new method Line.check_compatibility_with_prebuilt_kernels

Full Changelog: v0.36.5...v0.37.0