new icon look, change to new icon workflow

changes
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• Style overhaul, new thinner look
• reentry of name categories -> new prefixes
	- podlove (for podlove specific symbols & logos)
	- controls (for player control buttons
	- bigcontrol (for huge play/pause button)
	- circled (for rounded micro-buttons)
• new look for „info“
• share icon now utilize apple look

new icons
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• podlove-subscribe
• menu
• circled-info
• controls-forward
• controls-back
• fullscreen-on
• fullscreen-off
• delete
• clock
• controls-speed-minus
• controls-speed-plus

removed icons
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some legacy icons that have never been used
specific time control icons (1x, 1,5x, 2x)