Add schemes for shell POSIX and shell bash

[chpock]

Add a new schema for POSIX shell with block structures and error checking.

Previews are available at: https://github.com/chpock/ck.colorer-schemes/tree/main/preview
They are generated from samples at: https://github.com/chpock/ck.colorer-schemes/tree/main/hrc/test/source

This fixes:

• shell scheme expects closing parenthesis where it is not required #139
• sh error: 10#{arr[0]} #98
• sh error #96
• Problem with << operator in sh script #95
• bash issue #85
• [POSIX shell] Correct quoted strings nesting #65
• shell, Makefile: different colors for \<newline> and \<space> #119 (for shell scripts)

[ctapmex]

great work, thanks