org-element: Rename a few internal functions
* contrib/lisp/org-element.el (org-element--parse-elements): Renamed
from `org-element-parse-elements'.
(org-element--parse-objects): Renamed from `org-element-parse-objects'.
(org-element--get-next-object-candidates): Renamed from
`org-element-get-next-object-candidates'.
(org-element--interpret-affiliated-keywords): Renamed from
`org-element-interpret--affiliated-keywords'.
(org-element--current-element): Renamed from
`org-element-current-element'.
(org-element--collect-affiliated-keywords): Renamed from
`org-element-collect-affiliated-keywords'.
(org-element-center-block-parser, org-element-drawer-parser,
org-element-dynamic-block-parser,
org-element-footnote-definition-parser, org-element-inlinetask-parser,
org-element-plain-list-parser, org-element-quote-block-parser,
org-element-special-block-parser, org-element-comment-parser,
org-element-comment-block-parser, org-element-example-block-parser,
org-element-export-block-parser, org-element-fixed-width-parser,
org-element-horizontal-rule-parser,
org-element-latex-environment-parser, org-element-paragraph-parser,
org-element-src-block-parser, org-element-table-parser,
org-element-verse-block-parser, org-element-fill-paragraph,
org-element-context, org-element-at-point, org-element-interpret-data,
org-element-parse-secondary-string, org-element-parse-buffer): Apply
name change.
* contrib/lisp/org-export.el (org-export-get-buffer-attributes): Apply
name change.
* testing/lisp/test-org-element.el: Update tests accordingly.
* testing/lisp/test-org-export.el: Update tests accordingly.
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