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Python to Wasm Compiler (Garbage Collection) (#94)

* initial commit of wasm-compiler

* change type tags to be compile-time construct

previously, type tags were stored as wasm global consts. this changes it them to be inlined consts instead

* consolidate arithOp functions, add compareOp functions

* add string compare function

* change expr switch case to if else

* implement basic assignment

* add support for function declarations

* change arithmetic and comparison tags to objects

* WIP: begin implementing functions

* begin implementing functions

* add support for None, prevent implict function return

* add support for return statements

* add support for function parameters, add print built-in function

* add support for local variables

* initial attempt at closures

* WIP: heap allocated variables + lexical addressing

* heap allocated variables + lexical addressing

* add check for unbound variables

* WIP: nonlocal statement, wasm types

* WIP wasm types

* fix environment bug

* wasm types fluent for numerics

* WIP wasm block types fluent

* add error messages

* add nonlocal statement

* add pairs

* implicit return + WIP builder generators

* add builder, wat generator

* change blockType helper

* remove unused files

* add type to import

* add set_head, set_tail, fix build-in fx return env bug

* fix another environment bug

* begin integration with conductor

* rename instr to op

* add constraint for wasm labels

* add select to typed-builder

* add load narrow

* move wasm-util to its own package

* change to only use one apply function

* add native functions up to preapply

* use builder as type instead of strings, change blocktype

* add apply func to builder

* finish builder constants

* keep one variable for native functions

* native functions naming consistency

* WIP: builder generator

* finish builder generator

* fix native function bugs

* change comparison and arith functions to use buildBrTableBlocks

* clarify... (continued)

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