[Ohrrpgce] wip r13906: Add a saveitemdata overload that converts ItemDef back into ITM formatted itembuf()

[cron at rpg.hamsterrepublic.com]

https://github.com/ohrrpgce/ohrrpgce/commit/34590426d40602f87958392c3cf59d490fd71631
Author: james <james at 7d344553-34f0-0310-a9b1-970ce8f1c3a2>
Date:   Thu Jun 26 00:15:33 2025 +0000

    Add a saveitemdata overload that converts ItemDef back into ITM formatted itembuf()
    

 loading.bi   |  3 ++-
 loading.rbas | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 61 insertions(+), 1 deletion(-)