org-element: Activate lexical binding

org-element: Activate lexical binding

* lisp/org-element.el (org-element-section-parser):
(org-element-planning-interpreter):
(org-element-table-row-parser):
(org-element-timestamp-interpreter): Silence byte-compiler.  Tiny
refactoring.

(org-element--parse-objects): Tiny refactoring.

(org-element-interpret-data): Refactor code.
(org-element--interpret-data-1): Remove function.

(org-element-center-block-interpreter):
(org-element-item-parser):
(org-element-plain-list-interpreter):
(org-element-property-drawer-interpreter):
(org-element-quote-block-interpreter):
(org-element-section-interpreter):
(org-element-babel-call-interpreter):
(org-element-clock-interpreter):
(org-element-comment-interpreter):
(org-element-comment-block-interpreter):
(org-element-diary-sexp-interpreter):
(org-element-example-block-interpreter):
(org-element-export-block-interpreter):
(org-element-fixed-width-interpreter):
(org-element-horizontal-rule-interpreter):
(org-element-keyword-interpreter):
(org-element-latex-environment-interpreter):
(org-element-node-property-interpreter):
(org-element-paragraph-interpreter):
(org-element-src-block-interpreter):
(org-element-verse-block-interpreter):
(org-element-bold-interpreter):
(org-element-code-interpreter):
(org-element-entity-interpreter):
(org-element-export-snippet-interpreter):
(org-element-inline-babel-call-interpreter):
(org-element-inline-src-block-interpreter):
(org-element-italic-interpreter):
(org-element-latex-fragment-interpreter):
(org-element-line-break-interpreter):
(org-element-link-parser):
(org-element-macro-interpreter):
(org-element-radio-target-interpreter):
(org-element-statistics-cookie-interpreter):
(org-element-strike-through-interpreter):
(org-element-table-cell-interpreter):
(org-element-target-interpreter):
(org-element-underline-interpreter):
(org-element-verbatim-interpreter):
(org-element-map):
(org-element-normalize-contents): Silence byte-compiler.