Error when creating presets containing spaces or special characters

[danielkrafft]

I was using Assemblme to create build animations for sets with around 850 pieces. I applied the preset "Standard Build" and changed some of the settings. I attempted to name a new preset "Medium Set" and click create.

Clicking on the create button with a bad character results in the following error:

Description of the Problem:

Blender Version: 004.000.000
Addon Version: 1, 7, 0
Platform Info:
system = Windows
platform = Windows-10-10.0.19045-SP0
version = 10.0.19045
python = 3.10.13
Error:
EXCEPTION (<class 'FileNotFoundError'>): [Errno 2] No such file or directory: 'C:\Users\XXXX\AppData\Roaming\Blender Foundation\Blender\4.0\scripts\presets\assemblme\medium\ set.py'
C:\Users\XXXX\AppData\Roaming\Blender Foundation\Blender\4.0\scripts\addons\assemblme_v1-7-0\operators\presets.py
000 0110:write_new_preset() f = open(new_preset_path, "w")
001 0061:execute() self.write_new_preset(new_preset_name)

I was able to rectify the problem by naming the preset "Medium". Upon further testing, it seems the problem arises when including a space character in the preset name, as well as when including some special characters (!, #, $, ^, *) The following isn't necessarily an issue, but I also noticed that using an underscore "Medium_Set" will result in a preset named "Medium set", removing the underscore and capitalization of the second word. Naming a preset "MEDIUM_SET" will result in a preset named "Medium set" as well.

It would likely be preferable to pop up a message warning users about using some these characters, or supporting their use.
Great addon by the way!