Factorize NotifyChanges method

[gus-sosa]

Call two methods inside NotifyChanges:

1. For creating the toast's visual component
2. For creating the toast's action component

this helps in the future if it needs to change the implementation of one of this functionality

[gus-sosa]

The previous comment by itself does not make sense, but if I would want to send notifications via email or other way, NotifyChanges has to be factorized in order to allow other ways to notify.

Some of these ways:

• Send email
• Create a new file by notification
• Send notification to other application which does something with this notification

[gus-sosa]

@weedkiller , detect a file should be something easy to do. That might be implemented in FileWatcher.cs

Although I want to refactor/redesign this because at the pretty beginning I only wanted to see the toast notification for changes in a folder.

Now, it might be interesting to add some features, for that reason before writing any line of code. I will rethink the design/architecture of the code to be able to add new features easily.