Add missing items to Keyboard shortcuts info window

ci: fix goreleaser screw-up with icon path

ci: Fix Go version at 1.14.7 to address snap build errors

Fix possible race in schedulePlayerSettingChange

Select top item in Streams by default

Add Unix domain socket connectivity (resolves yktoo#10)

Fix: too frequent reconnection attempts (resolves yktoo#9)

ci: fix Xvfb command redirection

Use Go reflection to bind widgets in Builder (also resolves yktoo#3)

docs: README screenshot update