NSS try to create path, filename containing invalid windows characters like colon

@timbl @michielbdejong @RubenVerborgh @highlevellogic

Trying NSS on a windows pod https://bourgeoa.solid.hll.nu:7443 . Tested the chat with me from OS solid
The function returns a PUT error 500

FAILED to save new chat channel at: https://bourgeoa.solid.hll.nu:7443/IndividualChats/bourgeoa.solid.hll.nu:7443/index.ttl : Web error: 500 (Internal Server Error) on PUT of https://bourgeoa.solid.hll.nu:7443/IndividualChats/bourgeoa.solid.hll.nu:7443/index.ttl

This is due to the colon : in the folderPath

To ensure solid compatibility can we forbid the windows forbidden characters in pathName like \/:*%"<>| ?
This could be done in resource-mapper.js
Should it be OS dependent to allow any file OS file be URI capable.

index:name.ttl is valid POSIX file and URI, but invalid WINDOWS

從 resource-mapper.js 開始，追蹤要求的 URI 如何轉換成 Windows 檔案系統路徑。在 Windows 上使用包含冒號的路徑重現 chat-channel PUT，然後判斷處理是否應依賴作業系統，同時維持與有效 URI 路徑的相容性。當要求不再因 Windows 禁止的路徑字元而失敗時，即表示完成。