Since S4 method and chartSeries.chob are deprecated, dropTA, listTA and
get.chob functions are refactored to use panel functionality of
xts::plot.xts.

The way TAs are removed is based on which frame they are added to.

To reduce memory usage temporary storage is dropped and "replace()" function
is applied to re-order TAs and function calls instead. actions and y limits
are re-ordered according to the frames.

In addition to the movement of TA, function calls and actions are
re-ordered as well.

When "ta" is not characters of functions from TTR
(SMA, BBands, ...), shading regime or new series are
added if "ta" is logic or an object of xts class, respectively.