Improve error handling

* Simplify regex and fix unconverted characters.
* Also use Start-BitsTransfer for cmdline downloads (Closes #56).
* Also remove -DisableProgress now that we use Start-BitsTransfer.

.editorconfig

@@ -2,7 +2,8 @@
 root = true
 
 [*]
-trim_trailing_whitespace = true
-insert_final_newline = true
 # Must use a BOM else Unicode strings will not display
 charset = utf-8-bom
+insert_final_newline = true
+indent_style = space
+trim_trailing_whitespace = true