Improve touch event handling to support resize on android too

Signed-off-by: scripple <github@scripple.org>

Drag to resize doesn't work on android (at least newer versions).  This update fixes that and according to one tester still works on ios.  This also makes it work in chrome's mobile debug system.

Submitted in response to this issue.
https://github.com/samclarke/SCEditor/issues/290