[bugfix] html escape special characters in text instead of totally removing them (#719)

* remove minify dependency

* tidy up some tests

* remove pre + postformat funcs

* rework sanitization + formatting

* update tests

* add some more markdown tests

vendor/github.com/tdewolff/minify/v2/Makefile

@@ -1,58 +0,0 @@
-SHELL=/usr/bin/env bash
-NAME=minify
-CMD=./cmd/minify
-TARGETS=linux_amd64 darwin_amd64 freebsd_amd64 netbsd_amd64 openbsd_amd64 windows_amd64
-VERSION=`git describe --tags`
-FLAGS=-ldflags "-s -w -X 'main.Version=${VERSION}'" -trimpath
-ENVS=GO111MODULES=on CGO_ENABLED=0
-
-all: install
-
-install:
-	echo "Installing ${VERSION}"
-	${ENVS} go install ${FLAGS} ./cmd/minify
-	. cmd/minify/bash_completion
-
-release:
-	TAG=$(shell git describe --tags --exact-match 2> /dev/null);
-	if [ "${.SHELLSTATUS}" -eq 0 ]; then \
-		echo "Releasing ${VERSION}"; \
-	else \
-		echo "ERROR: commit is not tagged with a version"; \
-		echo ""; \
-		exit 1; \
-	fi
-	rm -rf dist
-	mkdir -p dist
-	for t in ${TARGETS}; do \
-		echo Building $$t...; \
-		mkdir dist/$$t; \
-		os=$$(echo $$t | cut -f1 -d_); \
-		arch=$$(echo $$t | cut -f2 -d_); \
-		${ENVS} GOOS=$$os GOARCH=$$arch go build ${FLAGS} -o dist/$$t/${NAME} ${CMD}; \
-		\
-		cp LICENSE dist/$$t/.; \
-		cp cmd/minify/README.md dist/$$t/.; \
-		if [ "$$os" == "windows" ]; then \
-			mv dist/$$t/${NAME} dist/$$t/${NAME}.exe; \
-			zip -jq dist/${NAME}_$$t.zip dist/$$t/*; \
-			cd dist; \
-			sha256sum ${NAME}_$$t.zip >> checksums.txt; \
-			cd ..; \
-		else \
-			cp cmd/minify/bash_completion dist/$$t/.; \
-			cd dist/$$t; \
-			tar -cf - * | gzip -9 > ../${NAME}_$$t.tar.gz; \
-			cd ..; \
-			sha256sum ${NAME}_$$t.tar.gz >> checksums.txt; \
-			cd ..; \
-		fi; \
-		rm -rf dist/$$t; \
-	done
-
-clean:
-	echo "Cleaning dist/"
-	rm -rf dist
-
-.PHONY: install release clean
-.SILENT: install release clean