rewrote config file path search (#219)

added comment to clarify coding choices

added package xdg to vendor folder

rewrote config file path search

Co-authored-by: crapStone <crapstone01@gmail.com>
Reviewed-on: https://gitea.com/gitea/tea/pulls/219
Reviewed-by: 6543 <6543@noreply.gitea.io>
Reviewed-by: Norwin <noerw@noreply.gitea.io>

vendor/github.com/adrg/xdg/.travis.yml

@@ -0,0 +1,19 @@
+language: go
+go:
+  - 1.11.x
+  - 1.12.x
+  - 1.13.x
+os:
+  - linux
+  - osx
+  - windows
+env:
+  - GO111MODULE=on
+git:
+  autocrlf: false
+before_install:
+  - go get -t -v ./...
+  - go install github.com/golangci/golangci-lint/cmd/golangci-lint
+script:
+  - golangci-lint run --enable-all -D wsl -D gochecknoinits -D gochecknoglobals -D prealloc
+  - go test -v -race ./...