Fix range selection to be inclusive

[Snuffy2]

This pull request improves the inclusivity of random value generation in the get_static_or_random method within animations.py. The changes ensure that both float and integer ranges can correctly include their configured upper bounds, addressing edge cases where the previous implementation would exclude them.

Random value generation improvements:

• For float ranges, uses math.nextafter to nudge the upper bound slightly upward, making the rounded result inclusively reach the configured upper value. This ensures that the upper bound can be selected when generating random floats.
• For integer ranges, adjusts the stop value in randrange by adding step, making the range inclusive when the upper bound aligns with the step.
• Imports the math module to support these changes.