Dedicated tags

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 ARK-Builders/ark-components-android#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 ARK-Builders/ark-components-android#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.

Start by reviewing the tag selector, the tags editor dialog in Gallery, the tag menu, and the dedicated tag editor described in the issue. Also read linked issues #18 and #20; done means quick and dedicated tags support the specified IDs, hierarchy, title searching, separators, and invalid-character feedback across those inputs.

Written by the indexing model from the issue text.