Added prefix option for folder note filename.

[bearoxo]

Option to add prefix to folder note filename.

Resolves #7

Solution

Users can now customize and add any string as prefix to the folder notes name in the plugin settings.

Changes:

• Added folderNotesPrefix to WaypointSettings with underscore as the default string value.
• String value for the folder note's name @ path manipulated in isFolderNote, locateParentWaypoint, locateParentWaypoint & updateWaypoint.