Andrew Nicols b7067f065e MDL-49627 core: Improve thumbnail generation ...

We now abstract the actual file generation to a new function.
We are then able to call this function from the other image generation
sources. This allows us to generate thumbnails in a more efficient manner.

* Stored files stay as stored files and are not temporarily re-written to
  disk;
* Strings containing an image remain as a variable and are not temporarily
  written to disk; and
* Arbitrary files are not captured to string.

2015-04-01 11:05:19 +08:00

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