[#1251] Fix bad import after view plugins rename
[#1251] Finish renaming pdfpreview -> pdf_view
[#1251] Finish renaming textpreview -> text_view
[#1251] Finish renaming recline_preview -> recline_view
[#1251] Rename pdf, text, and reclineview modules to *_view
Merge branch '1251-resource-view'