- introduced code regions
- moved class properties to appropriate regions
- fixed a few summary annotations to make it clearer what they do/return and adhere to Microsoft standards a bit better

- added public property to class for PythonTemplateFilePath
- added default value in the Settings constructor

Implemented support for the file path, following the model of the PreferencesFilePath.

- when adding a Python node, the template is read
- added conditional load & fallback on hardcoded text if template is not found
- replaced "\n" with `Environment.NewLine` in hardcoded template
- added new comment lines to default template, using Resources to make it easier for beginners
- fixed typo in existing Resources & XAML

- added an extra spacing line
- added spaces after `#` Python comment marker

The backing store is required as a static property cannot implement an interface member.

The backing store is private & static, so it doesn't get serialised when settings are saved. Hence, we add a public static method to access it.

gets rid of un-necessary initialisation of new `PreferenceSettings` or `PathManager` classes, see DynamoDS#8034 (review)

actually gets rid of un-necessary initialisation of new `PreferenceSettings` or `PathManager` classes, see DynamoDS#8034 (review)
forgot the PathManager in last commit.

removed duplicate file tracking for `AssemblySharedInfo.cs`
https://github.com/DynamoDS/Dynamo/blob/8e8fe12f89150be1fe7f24edf9931859b59c731a/.gitignore#L74

…to python-template

DynamoDS#8122 (comment)

…oModel

- removed static getter in PathManager and changed backing prop to instance
- added handling of user Python file, default file or no template
- added logging
- added log messages to `*.resx`
DynamoDS#8122 (review)

- added XML settings files for tests
- renamed existing settings file to fit in better with structure (easier to group & read by humans)
- consolidated files for previous test `oadInvalidPythonTemplateFromSetting` in `Settings.cs`

- test passes locally
- test requires 2 new python files, included them in same folder
- test generates 1 additional settings file when run, `DynamoSettings-PythonTemplate-changed.XML`
- test does not depend on hard-coded paths

these 2 tests were taking 10 minutes to run, had to disable them whilst building the new Python tests.

checking files required by test exist should be done before those files are read