Extended Applocking; Autoprocessingmode for copy/move; Private images

• Subproject Metadata
  • new #105 New mode App protected/pinned(Extended App Pinning) (aka "Kiosk Mode", "LockTask")
    • Allow to savley hand over your phone to someone else and allow him/her to view only those images that you have chosen before.
    • Appplication pinning is part of the Android operating system to lock the current app so that exiting the app or starting an other app is not permitted while pinning is active. Here is an android-5 tutorial.
    • Advanced pinning means that dangerous app-commands like edit/copy/delete/share/settings and changing the basefilter are disabled while the app is pinned.
    • usecase: Filter which photos your customer is allowed to see , enable "appplication pinning(Kiosk Mode)" and hande the android device over to the customer.
  • new #93 Folder based autoprocessing for copy/move photo(s)
    • Example: If you move IMG_20170921_085715.jpg to folder .../holiday/2017Crete/Hotel/ it will be automatically renamed to 201709krete022.jpg and gets tags holiday, greece, krete, hotel if you define a rule for that folder.
    • if a folder name in the folderpicker starts with a leading "..." then there is a ".apm" rulefile
    • the command "Edit Photo Autoprocessing" in the folder-long-press-contextmenu in the folderpicker allows you to edit a ".apm" rulefile
    • example:
      • the folder /sdcard/DCIM/photos/holiday/2017Crete/Hotel has a ".apm" rulefile with these rules
      • filename: [yyyymm]CreteHotel[001]
      • tags: holiday, hotel, greece
      • geo lat/lon: 35.5/23.9
      • title: holyday crete 2017 hotel
    • if you copy/move images to folder /sdcard/DCIM/photos/holiday/2017Crete/Hotel
      • the oldest images (taken in september 2007) will be renamed to 200709CreteHotel001.jpg, the next 200709CreteHotel002.jpg, ...
        • filenames that already follow the naming-rule are not renamed.
      • non empty meta data (tags,geo, description, title, rating, date taken) from ".apm" rulefile will be applied to the images.
        • geo is only applied if the photo does not have geo yet
        • date/time values are relative so you can fix the photo date if you forgot to set camera date
        • title/description starting with "+" will be appended to existing title/description
  • new#100 Mark images as "PRIVATE" and allow filtering include/exclude "PRIVATE". Private Images are hidden from other Gallery-Apps and image pickers by changing media_type to 1001 and fileextension to ".jpg-p".
  • Fix update tags/geo also update lastModified in mediadb (always in format secs since 1970). Else "sort by last modified" does not work.
  • Gallery view: Added sort by (image-)width, (file-)size
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