+ Add setting for dutch angle

If the setting “xcam_dutch_angle” is true, the horizon in a photo is
tilted like before commit 768c8b2caa.

init.lua

@@ -115,8 +115,9 @@ local create_photo_pixels = function( player_name )
 	local eye = girl:get_pos() + girl:get_eye_offset() / 10
 	eye.y = eye.y + girl:get_properties().eye_height
 	local dir = girl:get_look_dir()
+	local angled = minetest.settings:get_bool( "xcam_dutch_angle", false )
 	local right = vector.normalize(
-		vector.new( { x=dir.z, y=0, z=-dir.x } )
+		vector.new( { x=dir.z, y=angled and dir.y or 0, z=-dir.x } )
 	)
 	local down = vector.normalize(
 		dir:cross( right )

settingtypes.txt

@@ -1,3 +1,4 @@
+xcam_dutch_angle (Xcam Dutch Angle) bool false
 xcam_photo_height (Xcam Photo Height) int 128 16 192
 xcam_photo_width (Xcam Photo Width) int 128 16 192
 xcam_render_distance (Xcam Render Distance) float 128.0 1.0 256.0