Tiled inspector first prototype.
Add margins to slippy tile inspector bounding box.
Include all vertices/edges in the spatial index.
Add link edges and misc vertex to tiled inspector.

Tweak rendering.
Rename graph inspector tile resource API class.

Add javadoc to API class.
Remove warnings in OTPApplication class.
Add few comments to color palette classes.
Add few comments to TileRendererManager.
Move fancy AWT stroke to com.jhlabs.awt package.

Add few comments.
Merge pull request #1481 from laurentg/xyz-debug-layer

Slippy tile graph inspector