Removed inconsistent zoom factors in tileset view

I prefer if there's a single set of predictable zoom factors for both
the map and the tileset view.
Install the automappingconverter application
Flare export plugin: Remove checks for certain layers being there

The flare engine evolved and supports 2 more layers optionally.
The three layers which were checked being there, should still be there,
but are not necessary. Also I cannot recall any errors due to missing
or miss spelled layers during flare development, so I think we do not
need this check for flare.

The check for these three layers unintentionally hindered other projects
using this format, which is another reason to drop the check.

(cherry picked from commit 58a3d5f57a82d41671cad9aa89825b38ddc49072)