Update tiled_it.ts
Added Screen coordinates, taking the role of the old Pixel coordinates.
Map Objects are now in Pixel units internally.
Corrected IsometicRenderer's pixelToScreen/screenToPixel.
Merge branch 'screencoords' into mapobjectunitsv2
Updated object tools to use pixel units as needed.
Removed unnecessary conversions in IsometricRenderer.
Simplified use of zlib with Qt 5 on Windows

In fact Qt Core is still exporting the zlib symbols, but the symbols
are prefixed now. To use them QtZlib/zlib.h needs to be included.

No need to install zlib separately, yay!
addExternalTileset can now load multiple files at once.
Added error handling when loading multiple tsx files.
Pass PainterScale to MapRenderer, fixing bounding shadows.
Merge pull request #594 from mauvecow/multipletsxload

Allows adding multiple external tilesets at once.
Merge pull request #597 from mauvecow/maprendererscale

Adds painterScale to MapRenderer to fix shadow offset issues for rotated objects.
Added tile animation editor

Allows editing tile animations by drag & drop.
Implemented deleting of tile animation frames
Added option to disable playing of tile animations
Made undo/redo shortcuts work in tile animation editor

Also update the frame list as appropriate and make sure only one undo
command is created when deleting multiple non-consecutive rows at once.
Made animated tiles recognizable in the tileset view

By rendering a film strip on top.
Lua plugin: Support tile animations and image collection tilesets
JSON plugin: Added support for tile animations