Inf and NaN support added to GDScript.

modules/gdscript/gd_tokenizer.cpp

@@ -120,6 +120,8 @@ const char* GDTokenizer::token_names[TK_MAX]={
 "'\\n'",
 "PI",
 "_",
+"INF",
+"NAN",
 "Error",
 "EOF",
 "Cursor"};
@@ -901,6 +903,8 @@ void GDTokenizerText::_advance() {
 								{TK_SELF,"self"},
 								{TK_CONST_PI,"PI"},
 								{TK_WILDCARD,"_"},
+								{TK_CONST_INF,"INF"},
+								{TK_CONST_NAN,"NAN"},
 								{TK_ERROR,NULL}
 							};