Dedicated tags

[kirillt]

Let's call tags that we have right now as quick tags.
It would be nice to implement more powerful concept of dedicated tags.

Quick tags:

• easy to create
• id = title, which must not contain spaces
• no sophistication like parent/child tags

Dedicated tags:

• can be created from quick tags using [tag menu]
• can be created using separate [dedicated tag editor] dialog
• can have title with spaces and special characters
• will have parent tags and child tags Parent and child tags #18

Both quick and dedicated tags will have id which is a word without spaces and special characters. Id must be recognized as the tag in all text inputs ([tag selector], [tags editor] dialog in Gallery). These text inputs should also support finding the tag by typing only a part of the title (see #20) or typing it's parent tag.

White spaces must become a kind of separator in [tags editor] dialog (Gallery), the same as comma. Special characters should highlight unfinished input as invalid.