Signed integer overflow

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Hello,

There is a signed integer overflow within the library, within the following tags can trigger this resulting in denial of service within rlottie.
./harness small.json frame count: 1 starting... /home/rlottie/src/vector/freetype/v_ft_raster.cpp:1385:38: runtime error: signed integer overflow: -2147483648 - 2147483647 cannot be represented in type 'int'

This can be found here when loading in the Json file:

{ "v": "0", "": [], "assets": [ { "": 0 }, { "": 0, "id": "fr000", "h": 2 }, { "": 0 } ], "layers": [ { "": 0 }, { "": 0 }, { "": 0, "ks": { "": { "": 0 } }, "ty": 2, "refId": "fr000" } ] }

The overflow occurs when the parameters of refId are given 000 resulting in a overflow. This has to be within the layers function for the bug to be triggered:

rlottie/src/vector/freetype/v_ft_raster.cpp

Line 1434 in 67f103b

ras.bound_right - ras.bound_left,

harness.cpp.tar.gz