more shims, path, crypto, url

shims/btime.js

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+// Shim for the btime native module (file birth time)
+// Obsidian wraps this in try/catch: try{this.btime=window.require("btime")}catch(e){}
+// Returning null causes graceful degradation  -  mtime is used instead.
+
+export const btimeShim = null;