reduce typing to add enable/disable vary/target tag/id in xdeps.Optimizer

[rdemaria]

Proposals

• opt.enable(targets="ip",vary=[2,3]).disable(targets="phase",vary=["kqx.l1"]).step(...) : permanent
• opt.step(.., enable_targets="ip",vary=[2,3], disable_targets="phase",vary=["kqx.l1"]) : temporary in the step

Argument of enable/disable:

• if is list/tuple list of arguments
• elif integer arguments is id
• else argment is tag

[giadarol]

Implemented