Merge branch '14-improve-icons-and-images' into 'master'

Resolve "Improve icons and images"

Closes #14

See merge request !11

icons/skins/retro/8.svg

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icons/skins/symbols/0.svg

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icons/skins/symbols/1.svg

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icons/skins/symbols/2.svg

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icons/skins/symbols/3.svg

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icons/skins/symbols/4.svg

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icons/skins/symbols/5.svg

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icons/skins/symbols/6.svg

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+<svg enable-background="new 0 0 100 100" version="1.1" viewBox="0 0 100 100" xml:space="preserve" xmlns="http://www.w3.org/2000/svg"><rect width="100" height="100" ry="2" fill="none"/><rect width="100" height="100" fill="#c5c5c5" stroke="#000" stroke-linecap="round" stroke-linejoin="round" stroke-opacity=".5" stroke-width="2.6"/><g transform="rotate(45 50 50)" fill="none" stroke="#121212" stroke-linecap="round" stroke-linejoin="round" stroke-width="14"><rect x="47.741" y="15.282" width="4.5185" height="69.435"/><rect x="15.402" y="47.465" width="69.196" height="5.0708"/></g></svg>

icons/skins/symbols/7.svg

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icons/skins/symbols/8.svg

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