feat(config: menu): use more icons; use menubar.utils.lookup_icon() f…

…or app icons

Done with the first attempt with only top panel.

last "classic" release

Merge pull request #11 from actionless/devel

fixed notifications transparency, spotify date tag; updated readme.

finished fixing themes; added screenshots to readme

widgets:

- added 'advanced layout box' widget
- strip music widget output
- moved parser of untagged media for music widget to a separate module
- added cmus backend to music widget
- use la in cpu widget

theming:
- added lcars_modern theme
- updated tango_dark, pokemon_dark and LCARS themes
- added hack for panel margin
- added generalized widget decorations
- placed some widgets inside decorated containers
- added icons for big floating titlebar

fix:
- escape double quotes in async pipe receiver
- client menu on empty tag
- lots of minor fixes

added new themes; more stable work; swaggy decorations

works with awesome 3.5.5; refactored few widgets; added netctl

first published stabl version (for awesome v. 3.5.2)