Extend MapCSS implementation

[rurseekatze]

Compare the MapCSS implementation of node-tileserver with other implementations and drafts and add missing features and ensure compatibility:

• https://josm.openstreetmap.de/wiki/Help/Styles/MapCSSImplementation
• http://wiki.openstreetmap.org/wiki/MapCSS/0.2/Proposal_layer_selector
• http://wiki.openstreetmap.org/wiki/MapCSS/0.2
• http://wiki.openstreetmap.org/wiki/MapCSS/0.2/Proposal_lists
• http://wiki.openstreetmap.org/wiki/MapCSS/0.2/eval

[rurseekatze]

When finished, create a detailled documentation about the MapCSS implementation.

[don-vip]

Hi,
We plan to remove support for media queries.
Today, OpenRailwayMap is the last project to still use this feature.
@support rules should be added first, as noted by @DerDakon, see:

• style: replace deprecated "@media" by "@supports" OpenRailwayMap/OpenRailwayMap#451
• https://josm.openstreetmap.de/wiki/Help/Styles/MapCSSImplementation#supportsruleforconditionalprocessingsince8087

[DerDakon]

I'll look into this, but it will take some days.

[don-vip]

Thanks! :)