NEWT iOS: Support Multi-Touch Events, PixelScale, ..

Note: Two subsequent commit will add some required change in the
native UIWindow/UIView creation methods to actually make the NEWT view being displayed ;-)

The demo 'com.jogamp.opengl.demos.ios.Hello' demonstrated a standard NEWT application
running on iOS.
Previous NativeWindow wrap-around demo is preserved in 'com.jogamp.opengl.demos.ios.Hello1'.

Tested on ipad 11'inch arm64 and x86_64 simulation:
- Using GearsES2 demo
- PixelScale 1f, 2f and 0f - last two using max pixel scale
- Touch w/ GearsES2 works:
-- 1 finger rotate
-- 2 finger drag
-- 2 finger pinch-zoom gesture detection

1 files changed, 1 insertions, 0 deletions

diff --git a/src/nativewindow/native/ios/IOSmisc.m b/src/nativewindow/native/ios/IOSmisc.m
index 70cff4c06..1983143df 100644
--- a/src/nativewindow/native/ios/IOSmisc.m
+++ b/src/nativewindow/native/ios/IOSmisc.m
@@ -367,6 +367,7 @@ NS_DURING
     if(NULL != subviews) {
         for(int i=0; i<[subviews count]; i++) {
             UIView* sub = [subviews objectAtIndex: i];
+            [sub removeFromSuperview];
             [sub setHidden: YES];
             [sub release];
         }