#5 save button & shortcut

[Vincent FIACK]

pollo is great, but there is one simple thing that is
missing. In the toolbar, there is no Save button. This
is not really important, but it doesn't cost much to
add it. If we could also type Ctrl+S that would even be
better.

Thank you.

[Nobody/Anonymous]

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This is also not really important but makes Pollo user friendly.

Add a validation button and customizable toolbar.

Thank you