comment field for snippets

[Rado]

issue:

 - many snippets are hard to organise

 - there is no way to document what a snippets is doing

 

feature req:

when creating snippet add a new field called 'comment/doc' that can be used to store some text like description or some kind of documentation along the snippet code itsel.

this filed should not be pasted when snippet is executed but rather be used to describe the snippet