fix
- (view) images with upper case extension are not recognized as images
- (contact) window could not be closed
- (view) audio, video has no focus, when open by mouse
feature
- (config) id -> data-name
- (view) isAudio: add m4a
- (view) rm FocusWas
- (exit) add
- (server) add error listener
- (cloudcmd) root: add directory check
- (cloudcmd) args: add check of unknown options