Add check-webkit-style with flycheck-mode in c++-mode
Disable orgtbl-mode in c-mode, c++-mode

In source code,
1: return a == 0
2:   || b == 0
orgtbl-mode try to treat Line 2 as table.
Update gtags (global -u) by C-<f8>

- Also highlight line in gtags-select-mode