test: expand golden C-codegen tests from 2 to 8 examples

Add golden tests for: structs, generics, algebraic_enums, enums,
methods, strings. Each test captures the expected C output from the
bootstrap compiler for regression detection.

Also remove leftover 'PARSER FIX V2 ACTIVE' debug print from parser.bux.

src/parser.bux

@@ -553,7 +553,6 @@ func parserParsePostfixExpr(p: *Parser) -> *Expr {
                 let siCol: uint32 = parserCurToken(p).column;
                 let typeName: String = left.strValue;
                 var fieldCount: int = 0;
-    PrintLine("PARSER FIX V2 ACTIVE");
                 var firstField: *Expr = null as *Expr;
                 var lastField: *Expr = null as *Expr;
                 while !parserCheck(p, tkRBrace) && parserPeek(p, 0) != tkEndOfFile {