Since we want to distribute only the fat binary in the official templates, this should
make it work out of the box. 32 bits and 64 bits options are still available for people
that want them, but will throw an error if the binaries are not in the template zip.
Useful for everybody wanting to package godot.
Fixes#1026.
-> Retain the old behaviour: path in error msg only when exporting.
-> User templates override system templates
-Visible 2D and 3D Shapes, Polygons, Tile collisions, etc.
-Visible Navmesh and Navpoly
-Visible collision contacts for 2D and 3D as a red point
-Customizable colors in project settings
-=-=-=-=-=-=-=-=-=-=
-Sprite3D and AnimatedSprite3D support.
-Opaque pre-pass works, is compatible with shadows
-Improved shadow map rendering (can differentiate between plain opaque and opaque with shaders/discard/etc)
-Added option to use alpha discard in FixedMaterial
-Improved Glow FX, many more options (three modes, Additive, Screen and SoftLight), strength and scale
-Ability for Background (image or cubemap) to send to glow buffer
-Dumb Deploy of clients now actually works in Android
-Many Many rendering fixes, 3D is much more usable now.
