add euclidean modulo and remainder infix operators

ast/src/main/ast/pork.yml

@@ -64,6 +64,12 @@ types:
     - name: NotEquals
       values:
         token: "!="
+    - name: EuclideanModulo
+      values:
+        token: "mod"
+    - name: Remainder
+      values:
+        token: "rem"
   InfixOperation:
     parent: Expression
     values:

ast/src/main/kotlin/gay/pizza/pork/ast/InfixOperator.kt

@@ -12,5 +12,7 @@ enum class InfixOperator(val token: String) {
   Multiply("*"),
   Divide("/"),
   Equals("=="),
-  NotEquals("!=")
+  NotEquals("!="),
+  EuclideanModulo("mod"),
+  Remainder("rem")
 }