Add "check for dupes" option to "listAdd.." funcs (xNVSE#91)

* Add check for dupes arg

* Clear away Unsigned vs Signed weirdness

* add nullcheck to GetIndexOf

Fix compilation of nested one line lambdas

Merge pull request xNVSE#69 from Demorome/Fix-CallFunctionScript-Result

Make `CallFunctionScript` properly return an array element.

Merge branch 'master' of https://github.com/xNVSE/NVSE

Copy ref and var list instead of referencing it in case parent script…

… is temporary (console scripts for example)

Fix public ref map arrays not saving

Do not freeze with bugged cosaves from 6.1.8

Update LambdaManager.cpp

Update ScriptAnalyzer.cpp

Some final minor changes before release