UI/API changes

• CHANGE: Ambassador probe management: csv download of list
• CHANGE: LatencyMon: show fetched data resolution
• CHANGE: Region Meshes: add links to download raw data
• CHANGE: New interface for API key generation and single API call
• FIX: Erroneous anycast labels on anchors
• FIX: LatencyMon: time windows mistakenly asking to "load more data"
• FIX: LatencyMon: sometimes missing rtt data at large zoom levels
• TWEAK: Add links and descriptions to use cases
• TWEAK: Expand API regeneration infotext