Minor Textinput Updates

This is a minor PR that improves the textinput API and behavior when dealing with masked input, such as passwords.

Changed

• SetCursor(int), CursorStart() and CursorEnd() no longer return values.
• If EchoMode is not EchoNormal word-to-word movement instead jumps to the beginning and end. Word-based deletion also deletes to the beginning and end.

New

• Cursor() int returns the cursor position.

Removed

• Removed Cursor string, which did absolutely nothing.

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