Handle changes from Cython 3.0

In updating one of my development environments, I discovered that Cython has released version 3.0 after our 2.0.1.post1 release. This exposes a few issues (none of which are fatal) with our implementation:

While we were getting a warning about using a deprecated NumPy API under Cython 0.29, Cython 3.0 now makes it possible to remove the warning. Use the migration guide to update the build appropriately.

.../lib/python3.11/site-packages/numpy/core/include/numpy/npy_1_7_deprecated_api.h:17:2: warning: #warning "Using deprecated NumPy API, disable it with " "#define NPY_NO_DEPRECATED_API NPY_1_7_API_VERSION"

It appears that Cython 3.0 deprecated the "DEF" statement (cython/cython#4310). This affects the sbdf.pyx module, but only for the static constants used to process dates, times, and decimal values. Refactor this usage to avoid triggering the (currently) warning.

warning: spotfire/sbdf.pyx:82:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See https://github.com/cython/cython/issues/4310
warning: spotfire/sbdf.pyx:83:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See https://github.com/cython/cython/issues/4310
warning: spotfire/sbdf.pyx:84:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See https://github.com/cython/cython/issues/4310
warning: spotfire/sbdf.pyx:103:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See https://github.com/cython/cython/issues/4310

Along with the "DEF" statement, the "IF" statement used to conditionalize the platform-specific code in codesign.pyx and cabfile.pyx is now deprecated also. Since the recommended options don't work well for platform-specific code, we need to refactor these modules so that the platform-specific code is in separate files and the conditionality is moved into the setup.py script (making sure to remove the current logic that excludes the generated C files from the distribution and the cython_c_in_temp flag on the Extension objects).
```
warning: spotfire/cabfile.pyx:11:0: The 'IF' statement is deprecated and will be removed in a future Cython version. Consider using runtime conditions or C macros instead. See https://github.com/cython/cython/issues/4310
warning: spotfire/codesign.pyx:10:0: The 'IF' statement is deprecated and will be removed in a future Cython version. Consider using runtime conditions or C macros instead. See https://github.com/cython/cython/issues/4310
```
It appears that Cython 3.0 has updated exception handling propagation for cdef functions declared without except clauses. While this should automatically fix part of #44, we should check other uses and either move to using the new "noexcept" clause where exceptions should not be propagated, or remove places where we explicitly added "except *" clauses to force propagation.

Fix these issues and update the minimum requirement to Cython 3.0.

spotfiresoftware / spotfire-python

Handle changes from Cython 3.0 #47