fix for #906, 1) windows paths like C:\a\b weren't accepted because b… (#935)

* fix for #906, 1) windows paths like C:\a\b weren't accepted because backslashes were treated as escape sequences, 2) common paths like C:\Program Files\Foo\Foo.exe weren't accepted because of the space in the path

* Using anothing approach,
a) backslashes are no longer treated as escape characters,
b) string change to remind people to add spaces

* Removing joplin.pot from the patch, it will be updated later.

* Removing unused code.

ReactNativeClient/lib/services/ExternalEditWatcher.js

@@ -127,8 +127,7 @@ class ExternalEditWatcher {
 		const editorCommand = Setting.value('editor');
 		if (!editorCommand) return null;
 
-		const s = splitCommandString(editorCommand);
-
+		const s = splitCommandString(editorCommand, {handleEscape: false});
 		const path = s.splice(0, 1);
 		if (!path.length) throw new Error('Invalid editor command: ' + editorCommand);