TouchMenu: tweak menu search (#9926)

- Cleanup search and animation codes, fix inconsistencies
  between animation/no-animation opening, and refreshes
  glitches on eInk.
- Show menu item on tap, with buttons to either open
  directly, or to walk there (removed earlier "Animation"
  checkbox, so the choice can be decided later).
- Move event handlers into ReaderMenu/FileManagerMenu.
- Avoid duplicated and confusing results from gestures
  and font-family submenus.

frontend/apps/reader/modules/readerfont.lua

@@ -593,6 +593,7 @@ Enabling this will ignore such font names and make sure your preferred family fo
                 self:updateFontFamilyFonts()
             end,
             sub_item_table = {
+                ignored_by_menu_search = true, -- those would be duplicated
                 {
                     text = T(_("Font for %1"), BD.wrap(T("'font-family: %1'", family_tag))),
                     separator = true,