Normalize CANdo bit_start Ranges To Plain Integers

[coderask]

Summary

In GRCAN.CANdo, 26 bit_start values used range notation (e.g. bit_start: 0-7) instead of plain integers (bit_start: 0). The range end is always derivable from bit_start + type_width(data_type) - 1, making it redundant information.

Every Perl parser was already stripping the range on read:

• DBCparser.pl used $v =~ s/-.*//smx; in two places
• STRUCTparser.pl only captured (\d+) so it ignored ranges naturally

Changes

1. GRCAN.CANdo -- Converted all 26 bit_start range values to plain integers (just the start value).

2. DBCparser.pl -- Removed the now-unnecessary range-stripping logic:

   • Removed $v =~ s/-.*//smx; from the Message ID signal parsing block (line 858).
   • Simplified the Custom CAN ID bit_start regex from ([\d\-]+) to (\d+) and removed the $bs =~ s/-.*//smx; line (lines 913-915).

Why

• The range notation was redundant and a source of complexity.
• Removing it simplifies the parsers and reduces special-case handling.
• This is preparatory cleanup for future Rust parser migration.