Clean up code. Reorganize files. Port stuff from other branches. + more

This turns the project into a monorepo using pnpm workspaces,
dramatically simplifying the build process. It also fixes a lot of bugs
and just generally makes the codebase a lot cleaner.

packages/solver/package.json

@@ -0,0 +1,11 @@
+{
+    "name": "solver",
+    "description": "Zig WASM POW solver, not an actual node package, just using this so that pnpm will build it for me",
+    "version": "0.1.0",
+    "private": true,
+    "scripts": {
+        "build": "pnpm run build:wasm && pnpm run minify",
+        "build:wasm": "zig build --release=fast -Dtarget=wasm32-freestanding -Dcpu=generic+bulk_memory+bulk_memory_opt+simd128+tail_call",
+        "minify": "wasm-opt --strip-debug --strip-dwarf -O4 -o zig-out/bin/solver.wasm zig-out/bin/solver.wasm && wasm-opt --strip-debug --strip-dwarf -O4 -o zig-out/bin/validator.wasm zig-out/bin/validator.wasm"
+    }
+}