Improved AA Battery Storage Box

####Improved version of AA Battery Storage Box
[AAA Version here: https://www.thingiverse.com/thing:5608123]
[CR123a Version here: https://www.thingiverse.com/thing:5787481]

Liked the design from @TheSameNameTwice (https://www.thingiverse.com/thesamenametwice/designs), so i remixed it improving and reducing some weak points.

#####1. Top cover improved closing latch:
The lever is now longer, to have a smoother closure and more durability. Moreover the latch has a 'B' structure to support flexibility without breaking easily.

#####2. Bottom box has three improvements:
- The hinge is supported by three sturdy and smooth inserts coming from the bottom, increasing durability and avoiding breaking it during first assembly.
- Additionally I carved a V shape insert area to have a better hinge snap-in during assembly.
- Finally the front latching area is now improved a little because it was too thin in the original model.

Printed with tree supports to improve plastic structu