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Issue Description: selectWorldAndPan does not support world string identifiers because of inappropriate capitalisation of the "string" type.

https://github.com/webbukkit/dynmap/blob/v3.1/DynmapCore/src/main/resources/extracted/web/js/map.js#L594

• Dynmap Version: v3.1 & v3.2-beta-3
• Server Version: N/A
• Pastebin of Configuration.txt: N/A
• Server Host (if applicable): N/A
• Pastebin of crashlogs or other relevant logs: N/A
• Other Relevant Data/Screenshots: N/A
• Steps to Replicate: N/A

• I have looked at all other issues and this is not a duplicate
• I have been able to replicate this