add key command to reset |chromemargin|
change parameter to stylesheet type constant
remove useless replace parameter
Util: change do register parameter to do remove option
Util: add checking duplicated CSS
change option name
Util: minor fixup

* lighten try block
* use let
* arrange new lines
SiteStyle: delete WeakMap wrapper
SiteStyle: update site CSS
remove prefix 'm' from handler name
SiteStyle: improve settings for commands

* remove |quickApply| and add |quickScript| function
* rename |command| into |script| and separate |style| to handle the CSS
* remove |wait|: handle the wait processing in each |script|
* create CSS handler |PageCSS|