refactor: 重构标准库

lib/math/factorial/factorial.snow

@@ -1,7 +1,7 @@
 module: Math
     function: main
-        parameter:
+        params:
-        return_type: int
+        returns: int
         body:
             Math.factorial(6)
             return 0
@@ -9,9 +9,9 @@ module: Math
     end function
 
     function: factorial
-        parameter:
+        params:
             declare n:int
-        return_type: int
+        returns: int
         body:
             declare num1:int = 1
             loop:

lib/os/OS.snow

@@ -1,9 +1,9 @@
 module: os
     import: os
     function: print
-        parameter:
+        params:
             declare i1: int
-        return_type: void
+        returns: void
         body:
             syscall("PRINT",i1)
         end body

lib/test/Dead_loop.snow

@@ -1,6 +1,6 @@
 function: main
-    parameter:
+    params:
-    return_type: int
+    returns: int
     body:
         loop:
             init: