Spring 0.82.7.1 bug fix release

Detailed changes since 0.82.7:

Engine / General:

• disable frame number prefix in messages to the console by default
• add temporary hack to not crash on HostIP=localhost

Engine / Lua:

• change parameter `useOverlay` from type number to bool in config access functions

Engine / Auto-Hosts:

• gracefully exit if the autohost is not reachable
• if the local socket supports IP v6, but AutohostIP is specified as IP v4, use v4 to connect
• stop server on config problem

Engine / Dedicated-Server:

• fix crash when game ends prematurely

Unitsync:

• add new function GetSpringVersionPatchset() (return "1" for a spring version of "0.82.7.1"
• remove accidentially added third paramter to Init()

Installer:

• fix: do not check for running .exe in silent-mode
• Zero-K: desktop-shortcut: rename & add icon

AI:

• KAIK: add missing initialization checks