Fix bugs in syntax files

Fix various bugs in syntax files.
Add c++ syntax file.
Only save last line's endstate in highlight function.

syntax_files/python3.yaml

@@ -22,9 +22,9 @@ rules:
       # decorators
     - brightgreen: "@.*[(]"
       # operators
-    - statement: "[.:;,+*|=!\\%@]" "<" ">" "/" "-" "&"
+    - statement: "([.:;,+*|=!\\%@]|<|>|/|-|&)"
       # parentheses
-    - statement: "[(){}]" "\\[" "\\]"
+    - statement: "([(){}]|\\[|\\])"
       # numbers
     - constant.number: "\\b[0-9]+\\b"