[About] optimize code for summary, [ViewGitLog] adjust summary

Example for skinners for the screens:

	<screen name="AboutSummary" position="0,0" size="256,64">
		<widget source="AboutText" render="RunningText" options="movetype=running,direction=top,startpoint=0,startdelay=1500,wrap=1,always=0,oneshot=1" position="0,0" size="256,64" font="FdLcD;26" />
	</screen>

	<screen name="SoftwareUpdateChanges_summary" position="0,0" size="256,64">
		<widget source="parent.title_summary" render="Label" position="120,0" size="136,40" font="FdLcD;17" halign="center" valgin="bottom" />
		<widget source="parent.text_summary" render="Label" position="0,42" size="256,22" zPosition="1" font="FdLcD;20" halign="center" valign="center" />
	</screen>