Add support for multi-style block comments

[lzulberti]

Description

This PR adds support for configuring multiple block comment styles by allowing array-valued configuration entries in:

• block_comment_001
• block_comment_002
• block_comment_003

Each position in the arrays represents one complete block comment style, and the same index is applied consistently across header, body, and footer. This makes it possible to define several valid block comment formats within the same project.

The change is backward compatible: existing single-value configurations continue to work as before and are internally handled as a single-style configuration.

This PR also enables autofix support for block comment separator normalization, for example by rebuilding header/footer separator lines to the configured length when the style can be determined safely.

Motivation

Some projects use more than one block comment convention, for example:

• section separators
• subsection separators
• doxygen documentation blocks

At the moment, the configuration supports only one block comment style at a time. This PR removes that limitation.

Example

Supported block comment styles may include:

--|==================================================================================
--| Section
--|==================================================================================

--|-----------------------------------------------------------------------------
--| Sub-section
--|-----------------------------------------------------------------------------

--! @brief Architecture definition of ..... entity
--! @details Architecture ....
--!    ....
--!    ....