Add image_picker library, refs #10046

Reason: before this commit app crashs in release mode,
there are no settings for this app (in ios settings app).

After adding image_picker library and getImage() function in
lib/common.dart (pre caution against AOT compiller dead code
elemenation) after ask permissions for camera usage.

pubspec.yaml

@@ -8,6 +8,7 @@ dependencies:
   sprintf: "^3.0.2"
   path_provider: "^0.2.1+1"
   sqflite: any
+  image_picker: '^0.1.3'  # use for ask permissions @ iOS
   flutter:
     sdk: flutter
 
@@ -73,4 +74,4 @@ flutter:
   #     fonts:
   #       - asset: fonts/TrajanPro.ttf
   #       - asset: fonts/TrajanPro_Bold.ttf
-  #         weight: 700
+  #         weight: 700