Experimental version of SwiftGodot that compiles for SwiftWasm

Changes made to get this working:

• Fully removed all macro code
• Updated code gen to use explicit Int64 instead of Int, which is 32 bit in Wasm
• Removed NIO locking code — it would not compile as it was. I also believe that wasm is single thread, so maybe this is ok?
• Updated some hex constants to fit in 32 bit. No idea if this is safe.