Python docstring folding

Features

Make it possible to fold Python multiline docstrings.

Initial release

Name		Name	Last commit message	Last commit date
.vscode		.vscode
src		src
syntaxes		syntaxes
.eslintrc.json		.eslintrc.json
.gitignore		.gitignore
.vscodeignore		.vscodeignore
CHANGELOG.md		CHANGELOG.md
README.md		README.md
language-configuration.json		language-configuration.json
package-lock.json		package-lock.json
package.json		package.json
tsconfig.json		tsconfig.json
vsc-extension-quickstart.md		vsc-extension-quickstart.md
webpack.config.js		webpack.config.js