Wishlist: Add new feature to 'boot' an item folder from textfiles.

[pjotrek-b]

Current design on the CInbox is to require one-folder-per-item.
This works great, and makes it clear what things/subfolders/files belong to which item, but in some cases it would be desirable to start the CInbox with a file, instead of a folder.

Here's some design ideas/notes:

1. A file must have its Item identifier in the filename.
2. In a way that is clearly and unmistakingly parsable (eg ItemID as beginning of filename)
3. Use RegEx to extract the ItemID from a filename pattern
4. In the loop which usually iterates through the items-todo-folder, check for files present that match the RegEx given in ITEM_ID_VALID in the cinbox.ini

Once a file is found, the following steps are done:

1. Create a folder in TODO with the ItemID
2. Move the file to that folder.
3. file-to-folder "boot" process finished: continue with regular CInbox processing.