Luma-core

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| | * Moved emulator code to ``rm-hull/luma.emulator`` github repo | |
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| | * Configurable ``transfer_size`` on SPI writes | |
| | * Documentation updates | |
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| | * Use spidev's ``writebytes()`` rather than ``xfer2()`` | |
| | * Dont write GIF animation if nothing was displayed | |
| | * Attempt to optimize palette when saving GIF animations | |
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| | * Don't report errors in shutdown | |
| | * Don't package as zip-safe | |
| | * Add 7-segment LED emulation transformer | |
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