Log Message:
7kaa: Update to 2.15.3

This release fixes bugs, improves synchronization in multiplayer, has UI fixes, \ 
and adds several advanced config options.

Summary of changes from 2.15.2 to 2.15.3

- Fixed corrupt characters and fields in various in game messages.
- Improved translation support.
- Updated translations.
- Added some UI improvements.
- Fixed some crashing issues related to spies.
- Standardized on FPU code generation for better cross-platform compatibility.
- Added more advanced config options.
- Added more advanced config options.
- Improved manual.
- Added key binding support.
- Prevented chat keystrokes registering as a hotkey too.
- Fixed sometimes hiring wrong unit in the inn.
- Added scenario advanced config presets to restore default scenario game play \ 
to original game design parameters.
- Ensure screen redraw when dropping spy identity.
- Improved alternate font set.
- Added scroll button for long tutor messages.
- Removed gong sound for unsent AI diplomatic messages.
- Re-enabled AI ability to request direct military aid; expect allied AI to work \ 
together on defending now.
- Removed uninitialized parameter in Caravan CRC check.
- Removed improper variable-size cast, causing incorrect action processing on \ 
64-bit platforms.
- Correct replay initialization for weather sync.