Air transport labels and symbols in violet #1033
Merged
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This improves general readability, especially at z=10-12 by changing color for airport symbols and captions to a violet tone (in line with the general use of violet for airport infrastructure) and thereby reducing the number of different label types in a blue tone and avoiding confusion, esp. with water and glacier labels - see also #1031.
Helipads (shown at z>=16) are included as per suggestion by @mkoniecz.
It also introduces new svg symbols for those two - the previous airport symbol was essentially semi-transparent leading to a very mushy appearance in case of busy backgrounds.
Rendering examples: