Rewrite markdown rendering to blackfriday v2 and rewrite orgmode rendering to go-org (#8560)

* Rewrite markdown rendering to blackfriday v2.0

* Fix style

* Fix go mod with golang 1.13

* Fix blackfriday v2 import

* Inital orgmode renderer migration to go-org

* Vendor go-org dependency

* Ignore errors :/

* Update go-org to latest version

* Update test

* Fix go-org test

* Remove unneeded code

* Fix comments

* Fix markdown test

* Fix blackfriday regression rendering HTML block

vendor/github.com/shurcooL/sanitized_anchor_name/.travis.yml

@@ -1,11 +1,11 @@
 sudo: false
 language: go
 go:
-  - 1.7
-  - tip
+  - 1.x
+  - master
 matrix:
   allow_failures:
-    - go: tip
+    - go: master
   fast_finish: true
 install:
   - # Do nothing. This is needed to prevent default install action "go get -t -v ./..." from happening here (we want it to happen inside script step).

vendor/github.com/shurcooL/sanitized_anchor_name/LICENSE

@@ -1,3 +1,5 @@
+MIT License
+
 Copyright (c) 2015 Dmitri Shuralyov
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
@@ -7,13 +9,13 @@ to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 copies of the Software, and to permit persons to whom the Software is
 furnished to do so, subject to the following conditions:
 
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
 
 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

vendor/github.com/shurcooL/sanitized_anchor_name/README.md

@@ -5,9 +5,11 @@ sanitized_anchor_name
 
 Package sanitized_anchor_name provides a func to create sanitized anchor names.
 
-Its logic can be reused by multiple packages to create interoperable anchor names and links to those anchors.
+Its logic can be reused by multiple packages to create interoperable anchor names
+and links to those anchors.
 
-At this time, it does not try to ensure that generated anchor names are unique, that responsibility falls on the caller.
+At this time, it does not try to ensure that generated anchor names
+are unique, that responsibility falls on the caller.
 
 Installation
 ------------

vendor/github.com/shurcooL/sanitized_anchor_name/go.mod

@@ -0,0 +1 @@
+module github.com/shurcooL/sanitized_anchor_name

vendor/github.com/shurcooL/sanitized_anchor_name/main.go

@@ -13,7 +13,7 @@ import "unicode"
 func Create(text string) string {
 	var anchorName []rune
 	var futureDash = false
-	for _, r := range []rune(text) {
+	for _, r := range text {
 		switch {
 		case unicode.IsLetter(r) || unicode.IsNumber(r):
 			if futureDash && len(anchorName) > 0 {