Velocity upgrade to 2.2

After 9 years Velocity finally got a update. You can see a detailed changelog on https://velocity.apache.org/engine/2.2/changes.html but here are the important new things from XWiki script authors:

• Allow expressions inside []: $foo[$bar + 1]
• New strategy for reference boolean evaluation:
  • return false for a null object
  • return its value for a Boolean object, or the result of the getAsBoolean() method if it exists.
  • if directive.if.emptycheck is false (true by default), stop here and return true.
  • check for emptiness:
    • return whether an array is empty.
    • return whether isEmpty() is false (covers String and all Collection classes).
    • return whether length() is zero (covers CharSequence classes other than String).
    • returns whether size() is zero.
    • return whether a Number strictly equals zero.
  • check for emptiness after explicit conversion methods:
    • return whether the result of getAsString() is empty (and false for a null result) if it exists.
    • return whether the result of getAsNumber() strictly equals zero (and false for a null result) if it exists.
• Support $array.empty, as for $list.empty
• Fix parsing of $obj._method()
• Have #foreach honnor the Closeable interface on the iterator
• Fix regression: #set<tab>left-paren no longer valid grammar
• Fix parser for '$map{key}' text rendering
• #foreach should work over any Iterable class
• Method arguments can now be expressions
• Fixed quotes escaping so that doubling single quotes only works when enclosing quotes are single quotes (and same behaviour for double quotes)
• Add ability to specify default values for macro parameters, e.g.; #macro(foo bar=1)
• Add ability to place line comments next to macro parameter definitions
• Block directives no longer require parenthesis so #@foo #end is now allowed. Also, brackets now work with Block Macros so #{@foo}bar#end works
• Default block for empty loops: #foreach($i in []) loop block #else empty #end
• Rendering of arrays should display their content, as for lists
• New generic $collectiontool which replaces and enhances the former SortTool
• New generic $logtool