General maintenance, multiprocessing improvements, bug fixes in tests, move to tqdm

[IainHammond]

A few changes and improvements for this one:

• support for python 3.14
• fixed the object tests, yay!
• move to fork for all instances of multiprocessing, and avoid "forcing" changes to the processing start method or the package crashing/becoming stuck when launching with forkserver or spawn
• using multiprocessing.get_context() instead of multiprocessing.set_start_method() as it can be unsafe to set or change the start method multiple times, which can occur if several VIP functions are called
• fix for a critical ValueError: setting an array element with a sequence being raised in the firstguess function due to changes in newer NumPy versions
• switch to tqdm as default backend for progress bars since pyrind is slower and not maintained anymore
• fixed a logic mistake in cube_inject_fakedisk where the frame was convolved and then turned into an ADI cube, instead of the other way around (slower, but correct)
• removed some global parameters in an attempt to support the spawn multiprocessing start method in the future
• dropped python 3.10 since it's near end of support (or reached it?) and NumPy doesn't support it anymore
• some typo fixes as always

For the future:

• VIP would benefit from supporting forkserver and spawn multiprocessing methods since fork is deprecated and spawn is needed for Windows
• adding a polar transform option, perhaps to var
• adding a MJD to date and date to MJD convertor