Check for new Fether release & prompt user on startup

fix: Move moveWindowUp into showWindow for all OS. Do not use moveWindowUp when Fether window has a frame

fix: Fixes #442. Rearrange moveWindowUp so doesn't shrink on Windows 10 but still works and saves position

fix: Fixes cannot getContent of undefined bug when run TASKBAR=false and Close Window then re-open it

fix: Fixes cannot getContent of undefined bug when run TASKBAR=false and Close Window then re-open it

fix: Fixes #410. Prevent duplicate listeners

Fix accounts list not being scrollable (fix #430)

fix: Fresh sync shows blank screen

fix: Fixes #361. Restrict user from clicking "Scan" to process tx before gas is calculated

fix: Fixes #418. Removes resize animation since causes incorrect window to be shown

Fix light.setApi race condition

fix: Fixes #320. SUI-based modal overlays to prevent form field values reseting on sync. 

fix: Fixes #408 window resize by converting args[0] height to integer for setContentSize