piccode: Fixed a bunch of low hanging bugs

Author: hexaredecimal

src/main/java/org/piccode/backend/Compiler.java

@@ -46,7 +46,7 @@ public static PiccodeValue compile(String file, String code, List<PiccodeValue>
 			scope_id.line = 1;
 			scope_id.file = file;
 
-			Compiler.prepareGlobalScope(scope_id);
+			prepareGlobalScope(scope_id);
 			addGlobalFunctions();
 
 			PiccodeValue res = new PiccodeUnit();
@@ -61,6 +61,8 @@ public static PiccodeValue compile(String file, String code, List<PiccodeValue>
 			if (has_main) {
 				return new CallAst(new IdentifierAst("main"), List.of()).execute();
 			}
+			
+			Context.top.dropStackFrame();
 			return res;
 		} catch (PiccodeException e) {
 			e.reportError();
@@ -102,8 +104,8 @@ private static String sanitizeSourceFile(String code) {
 
 	public static void prepareGlobalScope(Ast parent) {
 		Context.top.pushStackFrame(parent);
-		Context.top.putLocal("true", new PiccodeBoolean("true"));
-		Context.top.putLocal("false", new PiccodeBoolean("false"));
+		Context.top.addGlobal("true", new PiccodeBoolean("true"));
+    Context.top.putLocal("false", new PiccodeBoolean("false"));
 		addGlobalFunctions();
 	}
 

src/main/java/org/piccode/piccodescript/Piccode.java

@@ -248,7 +248,6 @@ private static void repl(List<PiccodeValue> user_args) {
 
 		var bands = Chalk.on("| ").yellow();
 		System.out.println(bands + fmt);
-		Compiler.prepareGlobalScope(new IdentifierAst("globalScope"));
 		// Create a terminal
 		try (Terminal terminal = TerminalBuilder.builder()
 						.system(true)