Template refactor (#385)

* Initial implementation of new textx parser for template

* Implemented parser as singleton

* Moved grammar to .tx file

* Added filter templates

* Added filter templates

* Added tests for nested templates

* Added tests for filter+path_sep

* Added tests for filter+path_sep

* Added punctuation templates

* Added hook for --replace-keywords

* Updated docs for phototemplate

* Updated docs for phototemplate

* Updated tests data

* Updated tests data

* Updated docs for phototemplate

* Version bump

* Updated CLI help

* Fixed template processing for boolean, default

docs/_static/documentation_options.js

@@ -1,6 +1,6 @@
 var DOCUMENTATION_OPTIONS = {
     URL_ROOT: document.getElementById("documentation_options").getAttribute('data-url_root'),
-    VERSION: '0.40.16',
+    VERSION: '0.41.0',
     LANGUAGE: 'None',
     COLLAPSE_INDEX: false,
     BUILDER: 'html',