Add NEWS for 10.0 release

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>

NEWS

@@ -1,6 +1,50 @@
   Virt Viewer News
   ================
 
+10.0: Apr 20, 2021
+------------------
+
+  - Switch to use Meson for build system instead of autotools
+  - Require libvirt >= 1.2.8
+  - Redesign UI to use title bar widget instead of menu bar
+  - Request use of dark theme by default, if available
+  - Don't filter out oVirt DATA storage domains
+    for ISO image sharing
+  - Add --keymap arg to allow keys to be remapped
+  - Display error message if no extension is present
+    for screenshot filename
+  - Fix misc memory leaks
+  - Use nicer error message if not ISOs are available
+  - Use more explicit accelerator hint to distinguish
+    left and right ctrl/alt keys
+  - Report detailed file transfer errors
+  - Use standard about diaglog
+  - Refresh and improve translations
+  - Install appstream data file in preferred location
+  - Refresh appstream data file contents
+  - Display VM title when listing VMs, if available
+  - Display VM description as tooltop, if available
+  - Sort VM names when listing
+  - Enable ASLR and NX for Windows builds
+  - Add --shared arg to request a shared session for VNC
+  - Disable all accels when not grabbed in kiosk mode
+  - Allow num keypad to be used for zoom changes
+  - Disable grab sequence in kiosk mode to prevent escape
+  - Allow zoom hotkeys to be set on the command line / vv file
+  - Display error message if VNC connection fails
+  - Fix warnings about atomics with new GLib
+  - Remove use of deprecated GTK APIs
+  - Document cursor ungrab sequence in man pages
+  - Honour Ctrl-C when auth dialog is active
+  - Minor UI tweaks to auth dialog
+  - Support VM power control actions with VNC
+  - Add --cursor arg to control whether a local pointer is
+    rendered with VNC
+  - Add --auto-resize arg and menu to control whether to
+    resize the remote framebuffer to math local window size
+  - Add support for remote framebuffer resize with VNC
+  - Handle case sensitivity when parsing accelerator mappings
+
 9.0: May  1, 2020
 -----------------