Add syntax highlighting for module configuration paths in .dmd files

[Copilot]

The VS Code extension was not highlighting configuration file paths in module entries like dmclk board/stm32f746g-disco.ini.

Changes

• Grammar: Extended module-entry pattern to capture two additional optional groups: configuration paths and custom destination names
• Scope names: Added string.unquoted.path.config.dmd and string.unquoted.path.custom-name.dmd for theme colorization
• Documentation: Updated README with configuration path examples and bumped version to 1.2.0

Syntax now supported

# Module with configuration path
dmclk board/stm32f746g-disco.ini

# With version
uart@1.2.3 configs/uart_115200.ini

# With custom destination name
gpio configs/default.cfg my_gpio.cfg

The regex pattern maintains backward compatibility with existing module-only and module@version entries.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>VS Code extension nie wspiera konfiguracji dla modułów</issue_title>
<issue_description>Nie koloruje takiej składni jak na rysunku:

czyli:

# 
# File with list of modules to load
#
dmell
dmffs
dmramfs
dmdevfs@0.2
ls 
mkdir
dmclk board/stm32f746g-disco.ini
```</issue_description>

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

• Fixes VS Code extension nie wspiera konfiguracji dla modułów #209

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