2/4 Bug fix

【Bug Fixes】

1. Fixed an issue where units sometimes get stuck in the cavity under the water.

2. Adjusted the flag position when a keep is set as the base (still some offset issues with double keeps, etc.).

3. Fixed a bug where the technology to increase gun range wasn't properly extending the range as stated.

4. Fixed an issue where the range increase from newly acquired technology wasn't reflected until the battle started.

5. Fixed a bug where the water terrain data in a new game was severely misaligned at scales below 32m.

6. Fixed an issue where, if Zundamon saved during block placement tasks, the block placement marks would disappear upon loading, and different structures like stairs could be built in their place.