C-Support: Snippet browser

- Snippet browser default file names fixed.
- A few comments improved.
Perl-Support: hotkey not working / snippet browser

- Hotkey \nw not working in visual mode.
- Snippet browser settings improved.
Bash-Support: Snippet browser settings

- Snippet browser settings fixed.
- Minor improvements.
Merge branch 'master' of https://github.com/WolfgangMehner/vim-plugins