markdown parser rewritten, fixed lots of issues with og parser, also added support for specify code language in markdown like this:
```basic
10 LET N=10
20 FOR I=1 TO N
30 PRINT "Hello, World!"
40 NEXT I```
```basic
10 LET N=10
20 FOR I=1 TO N
30 PRINT "Hello, World!"
40 NEXT I```