[mercury][icons/src] Add 16 new system icons, and rename 2 system icons

[bsastregx]

Changes in this PR:

Mercury

• 16 new system icons were added:

category	name	colorType	representation
system	block	*
system	disturb	*
system	dock-to-left	*
system	dock-to-right	*
system	draft-doc	*
system	draft	*
system	favorite-fill	*
system	favorite	*
system	filters	*
system	flag	*
system	grid	*
system	mop	*
system	pin-fill	*
system	pin	*
system	status	*
system	unchecked	*
system	unpublished	*

(*) use the colorType of your choice

Breaking changes

Mercury

• 2 system Icons were renamed:

category	name before	name after	representation
system	expand	expand-content
system	filters	filter