Block Definition command-line forms, block record data and dialog defaults

-BLOCK, -WBLOCK, -BEDIT, ATTSYNC, BASE and INSBASE follow the reference
prompts and messages; empty blocks; WBLOCK keeps object coordinates and
stores INSBASE; annotative and hyperlink data on the block record; block
preview images; remembered dialog choices; block aliases.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/modules/insert/mod.rs

@@ -4,6 +4,7 @@ mod attdef;
 pub(crate) mod attedit;
 mod attman;
 pub mod base_point;
+pub(crate) mod block_cmdline;
 mod content_browser;
 pub(crate) mod create_block;
 mod design_center;