fix: custom_advisor splash images breaking game after save

[OH296]

Description of changes

• implemented save load to obj_ini.custom_advisor

Reasons for changes

• game break

Related links

• https://discord.com/channels/714022226810372107/1330393004673863763

How have you tested your changes?

• Compile
• New game
• Next turn
• Space Travel
• Ground Battle

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request implements saving and loading of custom advisor splash images to the game save file. This fixes a bug where the game would break after saving when custom advisor splash images were present.

File-Level Changes

Change	Details	Files
Implemented saving of custom advisor data.	Added ini_encode_and_json to save custom advisor data.	scripts/scr_save/scr_save.gml
Implemented loading of custom advisor data.	Added return_json_from_ini to load custom advisor data.	scripts/scr_load/scr_load.gml

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[sourcery-ai]

Hey @OH296 - I've reviewed your changes - here's some feedback:

Overall Comments:

• For a save/load fix, please verify the changes with additional test scenarios: loading existing saves (both with and without custom advisors), creating new saves with custom advisors, and loading those saves to ensure persistence works correctly.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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