unified calibre plugin (#6177)

joins calibre metadata search and calibre wireless connections into a single plugin

search metadata changes:

- search directly into calibre metadata files.
- search can be performed on more than one library (configurable from a menu)
- device scans now find all calibre libraries under a given root
- search options can be configured from a menu. (case sensitive, find by title, author and path)
- removed legacy global variables.
- *option* to search from the reader
- *option* to generate a cache of books for faster searches.

calibre wireless connection changes:

- keep track of books in a library (includes prunning books from calibre metadata if the file was deleted locally)
- remove files on device from calibre
- support password protected connections
- FM integration: if we're in the inbox dir it will be updated each time a book is added or deleted.
- disconnect when requested by calibre, available on newer calibre versions (+4.17)
- remove unused opcodes.
- better report of client name, version and device id
- free disk space checks for all calibre versions
- bump supported extensions to match what KOReader can handle. Users can override this with their own list of extensions (or from calibre, by configuring the wireless device).

frontend/apps/reader/modules/readergesture.lua

@@ -108,6 +108,9 @@ local action_strings = {
     wallabag_download = _("Wallabag retrieval"),
     kosync_push_progress = _("Push progress from this device"),
     kosync_pull_progress = _("Pull progress from other devices"),
+    calibre_search = _("Search in calibre metadata"),
+    calibre_browse_tags = _("Browse all calibre tags"),
+    calibre_browse_series = _("Browse all calibre series"),
 }
 
 local custom_multiswipes_path = DataStorage:getSettingsDir().."/multiswipes.lua"
@@ -792,6 +795,10 @@ function ReaderGesture:buildMenu(ges, default)
 
         {"kosync_push_progress", not self.is_docless},
         {"kosync_pull_progress", not self.is_docless},
+
+        {"calibre_search", true},
+        {"calibre_browse_tags", true},
+        {"calibre_browse_series", true},
     }
     local return_menu = {}
     -- add default action to the top of the submenu
@@ -1580,6 +1587,12 @@ function ReaderGesture:gestureAction(action, ges)
         self.ui:handleEvent(Event:new("KOSyncPushProgress"))
     elseif action == "kosync_pull_progress" then
         self.ui:handleEvent(Event:new("KOSyncPullProgress"))
+    elseif action == "calibre_search" then
+        self.ui:handleEvent(Event:new("CalibreSearch"))
+    elseif action == "calibre_browse_tags" then
+        self.ui:handleEvent(Event:new("CalibreBrowseTags"))
+    elseif action == "calibre_browse_series" then
+        self.ui:handleEvent(Event:new("CalibreBrowseSeries"))
     end
     return true
 end