Web based MIPS assembler and emulator

Matt Coles e697f89292 Refactor encoders to use a neater style 9 lat temu
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assembler.js 432c54a056 Initial commit 9 lat temu
encoders.js e697f89292 Refactor encoders to use a neater style 9 lat temu
utils.js 1a59bddd14 Add encodings for ORI and SW 9 lat temu