Fix issue with spaces in path names, update docstrings, and update version number

[dfkapraun]

• Fix issue with spaces in path names by reintroducing 'utils::shortPathName()' into 'fixPath.R'.
• Update docstrings for 'updateParms()' and 'updateY0()' in 'MCSim_model.R' to better reflect functionality of those methods.
• Update version number in 'DESCRIPTION' in preparation for the next release.

[Copilot]

Pull request overview

This PR addresses path handling issues on Windows, improves documentation clarity, and prepares for a new release. The changes focus on fixing a bug with spaces in Windows paths by reintroducing path normalization logic, updating method documentation to accurately describe their reset-then-update behavior, and bumping the version number.

Changes:

• Fixed Windows path handling to support spaces by converting to short path names
• Corrected typo in comment ("generate" → "generated")
• Enhanced docstrings for updateParms() and updateY0() to clarify that they reset to defaults before applying updates
• Bumped version from 1.1.9000 to 1.2

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
R/fixPath.R	Adds Windows-specific path normalization using shortPathName() and fixes typo in comment
R/MCSim_model.R	Updates docstrings to clarify reset-then-update behavior of parameter and state update methods
man/Model-class.Rd	Updates documentation to match improved docstrings in source code
DESCRIPTION	Updates package version to 1.2 for release

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