Unotes - notes with tags

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- supported markup (*bold*, /italic/, `monospace`, _underline_, +strike+) and links with titles ( `[[LINK][DESCRIPTION]]`)
- added "Tags Tree": screen with pseudo-hierarchy of tags
- text in notes on notes screen can be selected
- "Settings": added search
- expanded tag-panel in "Feed" now is shown as dialog
- improved scroll handle
- other bug fixes and improvements
- font size can be configured
- 1.6.1, 1.6.2, 1.6.3: fixes, optimized calendar, rich-text panel fixes