* Remove leftover comment & update another comment in 'Get-TabXaml' Private Function
* Add new 'CloseIconFontSize' Theme Option
This's done to fix the Visual Issue of the Close Button being smaller than the Settings Button.
* Rename 'CheckBoxBulletDecoratorFontSize' to 'CheckBoxBulletDecoratorSize'
* Experiment with DPI Aware Units
* Remove extra whitespace characters in 'theme.json'
* Implement Default Theming - Add Error Checking & Quitting Early upon XML Related Failures - Simple Code Formatting here & there
* Replace Tabs with Spaces to follow the conventions
* Fix some logic issue in 'Set-WinUtilUITheme.ps1' Private Function - Rename 'Set-WinUtilUiTheme.ps1' -> 'Set-WinUtilUITheme.ps1'
* Change output info from 'Write-Warning' to 'Write-Host' to make sure it's displayed even in RunSpaces as well as PowerShell 5 Environments
* Revert back to default Unit of Measuring for WPF (1/96 in)
* Revert "Remove leftover comment & update another comment in 'Get-TabXaml' Private Function"
This reverts commit 368e5980df.
* Update 'themes.json' so the general changes will work with PR #2629
* Support the fallback to default theme (if it exists)
* Update 'Set-WinUtilUITheme' Documentation
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Co-authored-by: MyDrift <personal@mdiana.ch>
