Add psd preview support (#15078)

* Add psd preview support

* Adding required vendor files

* Adding oov/psd license to NOTICE.txt file

* Adding the license notice for gopherjs to the NOTICE.txt

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

go.sum

@@ -529,6 +529,8 @@ github.com/onsi/gomega v1.7.1 h1:K0jcRCwNQM3vFGh1ppMtDh/+7ApJrjldlX8fA0jDTLQ=
 github.com/onsi/gomega v1.7.1/go.mod h1:XdKZgCCFLUoM/7CFJVPcG8C1xQ1AJ0vpAezJrB7JYyY=
 github.com/onsi/gomega v1.9.0 h1:R1uwffexN6Pr340GtYRIdZmAiN4J+iw6WG4wog1DUXg=
 github.com/onsi/gomega v1.9.0/go.mod h1:Ho0h+IUsWyvy1OpqCwxlQ/21gkhVunqlU8fDGcoTdcA=
+github.com/oov/psd v0.0.0-20200705094106-99303fb2511f h1:slBBh1GLx3xo0xx0v4HT0pI02+UcOJXTYRlg6QtN60Y=
+github.com/oov/psd v0.0.0-20200705094106-99303fb2511f/go.mod h1:GHI1bnmAcbp96z6LNfBJvtrjxhaXGkbsk967utPlvL8=
 github.com/opentracing/opentracing-go v1.1.0 h1:pWlfV3Bxv7k65HYwkikxat0+s3pV4bsqf19k25Ur8rU=
 github.com/opentracing/opentracing-go v1.1.0/go.mod h1:UkNAQd3GIcIGf0SeVgPpRdFStlNbqXla1AfSYxPUl2o=
 github.com/openzipkin/zipkin-go v0.1.1/go.mod h1:NtoC/o8u3JlF1lSlyPNswIbeQH9bJTmOf0Erfk+hxe8=