Revert "#1199328 by casey, bojanz: Add typehintings to every place which doesn't break the api. KUDOS"

This reverts commit 553f0e80.

#1307162 by cmurph: Check whether an argument is empty or not when loading the taxonomy term for the title

#1291658 by jackalope: Convert views_plugin_argument_default_taxonomy_tid to new return value of views_get_page_view

#1244876 by dereine: Let views_handler_argument_vocabulary_vid utilize the features of views_handler_argument_numeric

#1230306 by aaron.r.carlton, dereine: User and taxonomy default plugin updated to new behaviour of views_get_page_view

#1207680 by damz: Don't validate if there are no options set, the values are empty and required is not set

Issue #1207680 by dereine: Don't validate on term filters, because this causes views to not to save anymore. Added TODO

#1147326 by becw, dereine: Add a way to reverse transforming of argument values back to the original value, so you can use it for the summary. For example you can have now user: uid as argument but still have nice username urls.

Issue #1182762 by tim.plunkett: Remove periods in sentences on checkbox titles, as they are counter to UX standard.

by dereine: don't display the summary asc by count, sumamry desc by count on the termi depth handler

Use the term_tid filter handler on field term filters, modified slightly to restrict vocabulary correctly.

#975400 follow up by bojanz: Give field::sanitize_value more power and fix some issues with get_value.