Linux GUI support 1.0.49

• weston : 3ff4250b
• FreeRDP : c574044a
• pulseaudio: 2f0f0b8c

Changes:

WSLGg:

• WSLGd: allow customize log file path

Weston:

• rdp fontend/backend/shell: keep compositor sleep until window is created
• rdp shell: allow optional applist folder by .wslgconfig
• rdp shell: allow alt+F4 to close app
• libweston-desktop: xwayland window is not visible upon commit until mouse is moved
• build: use Ubuntu 20.04 for build verification