all: Become a Go module (fixes #5148) (#5384)

* go mod init; rm -rf vendor

* tweak proto files and generation

* go mod vendor

* clean up build.go

* protobuf literals in tests

* downgrade gogo/protobuf

vendor/github.com/syncthing/notify/appveyor.yml

@@ -0,0 +1,27 @@
+version: "{build}"
+
+os: Windows Server 2012 R2
+
+clone_folder: c:\projects\src\github.com\rjeczalik\notify
+
+environment:
+ PATH: c:\projects\bin;%PATH%
+ GOPATH: c:\projects
+ NOTIFY_TIMEOUT: 10s
+ GOVERSION: 1.10.3
+
+install:
+ - rmdir c:\go /s /q
+ - appveyor DownloadFile https://storage.googleapis.com/golang/go%GOVERSION%.windows-amd64.zip
+ - 7z x go%GOVERSION%.windows-amd64.zip -y -oC:\ > NUL
+
+ - cd %APPVEYOR_BUILD_FOLDER%
+ - go version
+
+build_script:
+ - go build ./...
+ - go test -v -timeout 120s -race ./...
+
+test: off
+
+deploy: off