[Ohrrpgce] wip r13937: Factor out common swap_in_hero and swap_out_hero functions

[cron at rpg.hamsterrepublic.com]

https://github.com/ohrrpgce/ohrrpgce/commit/8092d2d7dab66d38eaaa9c50f8137b78df5da79c
Author: teeemcee <teeemcee at 7d344553-34f0-0310-a9b1-970ce8f1c3a2>
Date:   Mon Jun 30 00:18:49 2025 +0000

    Factor out common swap_in_hero and swap_out_hero functions
    
    Feels strange to dedup code copy-pasted 27 years ago!
    

 game.bas           | 39 ++++++++++++++++++++-------------------
 game.bi            |  3 ++-
 moresubs.bi        |  2 ++
 moresubs.rbas      | 20 ++++++++++++++++++++
 scriptcommands.bas | 19 ++-----------------
 5 files changed, 46 insertions(+), 37 deletions(-)