Expression Name Changes

[cyrush]

Change ScalarGradient to be HistoryGradient in implementation and callable name to history_gradient

ascent/src/libs/ascent/runtimes/expressions/ascent_expression_filters.cpp

Line 1270 in a0e34e6

i["type_name"] = "scalar_gradient";

Change Replace to ArrayReplace in implementation.

Change ArrayGradient to HistoryGradientRange (?) in implementation. Think about naming for the interface.

[cyrush]

Also, should we have topology as an alias for topo ?
(in other expr funcs we have args named topology)

[cyrush]

resolved in #1167