Add function coercion for maps and arrays

[GuntherRademacher]

These changes add function coercion for maps and arrays by creating a new function with the required signature, that wraps a map or array function call along with a type check for the required target type:

    final FuncCall funcCall = new DynFuncCall(ii, sc, this, param);
    final TypeCheck check = new TypeCheck(ii, sc, funcCall, ft.declType, true);

This fixes these QT4 test cases:

• filter-007
• filter-008
• for-each-013
• for-each-014
• map-get-100
• xqhof20
• xqhof22

[ChristianGruen]

Locally merged.