Clean up language spec.

Author: Moderocky

src/main/java/org/byteskript/skript/compiler/SkriptLangSpec.java

@@ -212,7 +212,7 @@ private SkriptLangSpec() {
             new LongLiteral(),
             new FloatLiteral(),
             new DoubleLiteral(),
-            new DoubleLiteral()
+            new BooleanLiteral()
         );
         registerSyntax(CompileState.STATEMENT,
             new ExprVariableThread(),
@@ -233,16 +233,9 @@ private SkriptLangSpec() {
             new ExprContains(),
             new ExprMatches()
         );
-        registerSyntax(CompileState.STATEMENT,
-            new ExprVariableThread(),
-            new ExprVariableAtomic(),
-            new ExprVariableGlobal(),
-            new ExprVariable()
-        );
         registerSyntax(CompileState.STATEMENT,
             new ExprNewArray(),
             new ExprBracket(),
-            new BooleanLiteral(),
             new ExprThisThing(),
             new ExprTernaryOtherwise(),
             new ExprBinaryOtherwise(),