Rename sanitisation and escaping functions

- `window.sanitize` is now `Tools.escapeHTML`
- `window.unsanitize` is now `Tools.unescapeHTML`
- `window.jsEscape` is now `Tools.escapeQuotes`
- `window.htmlSanitize' is now `Tools.sanitizeHTML`
- `battle.escape` has been eliminated and replaced by calls
   to `Tools.escapeHTML`