Add support for one-sided alliances #1628

Job	Run time
Linux (clang, macos-14, Debug)	5m 48s
Windows (windows-2019, Visual Studio 16 2019, Debug, Win32)	9m 44s
Linux (gcc-9, ubuntu-20.04, Debug, 3.16.3, 1.71.0)	13m 44s
Linux (clang-10, ubuntu-20.04, Debug, 3.16.3, 1.71.0, true)	14m 35s
Linux (gcc-10, ubuntu-20.04, Debug, true)	15m 47s
Windows (windows-2019, Visual Studio 16 2019, Debug, x64)	10m 5s
Linux (clang-14, ubuntu-22.04, Debug, 3.22.1, 1.74.0, 17)	11m 20s
Windows (windows-2019, Visual Studio 16 2019, Release, Win32)	19m 34s
Linux (gcc-11, ubuntu-22.04, Debug, 3.22.1, 1.74.0)	11m 41s
Windows (windows-2019, Visual Studio 16 2019, Release, x64)	18m 48s
Linux (gcc-11, ubuntu-22.04, RelWithDebInfo, 3.22.1, 1.74.0)	15m 0s
Windows (windows-2022, Visual Studio 17 2022, Debug, Win32)	9m 43s
Linux (gcc-14, ubuntu-24.04, Debug)	11m 14s
Windows (windows-2022, Visual Studio 17 2022, Debug, x64)	10m 23s
Linux (clang-18, ubuntu-24.04, Debug, true)	14m 18s
Windows (windows-2022, Visual Studio 17 2022, Release, Win32)	18m 51s
Windows (windows-2022, Visual Studio 17 2022, Release, x64)	19m 13s
	3h 49m 48s

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