[MOD] maps: Use proper defaults to fill in missing style properties as recommended, and add a "vertex" rendering intent for future use (coming soon)

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@50365 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] maps: More fixes for the modify_feature mode as used in Cartograf - still more to do to support OpenLayers 2.13.1 properly (currently requires 2.12 as used in Tiki 11) and cosmetic weirdness when changing shape colours to be addressed...

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@50366 b456876b-0849-0410-b77d-98878d47e9d5