Fix: Eliminate symres phase #181
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This pull request resolves a long-standing technical debt in the Onyx compiler. The compilation pipeline of each node is separated out into multiple stages (parsing, type-checking, code generation). In the early days of the compiler, there was not an "async" mechanism in the compiler to allow for nodes to wait on other nodes to finish checking. Because of this, compilation was split into 4 steps, adding symbol resolution before type-checking to allow for more flexible programs.
Once the async mechanism was introduced into the compiler, splitting symbol resolution from type checking was entirely unnecessary. However, since each of these steps was thousands of lines of code, merging them was going to be a difficult, bug-prone undertaking. I have finally decided to tackle this technical debt and simplified the compiler in the process.
This change is "just as correct" as the current compiler in the master branch. Every program that compiled with the old compiler still compiles.