Better fix for #753

[opeongo]

• All comments are special tokens
• remove BSHFormalComment and add accessor methods to Parser
• add and modify tests
• adjust bshdoc.bsh to use accessor methods

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (ddf0a0e) 74.24% compared to head (cdddd91) 74.24%. Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #756 +/- ## ========================================= Coverage 74.24% 74.24% + Complexity 3042 3041 -1 ========================================= Files 108 107 -1 Lines 9357 9354 -3 Branches 1857 1857 ========================================= - Hits 6947 6945 -2 + Misses 2070 2069 -1 Partials 340 340 ``` | [Flag](https://app.codecov.io/gh/beanshell/beanshell/pull/756/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=beanshell) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/beanshell/beanshell/pull/756/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=beanshell) | `74.24% <ø> (+<0.01%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=beanshell#carryforward-flags-in-the-pull-request-comment) to find out more.

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[nickl-]

Looks good, just check on the debugging code.