0023142: Add option to show summary of issues instead of ID in timeline

ID	Project	Category	View Status	Date Submitted	Last Update
0023142	mantisbt	timeline	public	2017-07-23 09:22	2020-01-06 11:53

Reporter	Zipher	Assigned To	community
Priority	normal	Severity	minor	Reproducibility	N/A
Status	assigned	Resolution	open

Summary	0023142: Add option to show summary of issues instead of ID in timeline
Description	It was hard for our team to know which issue was updated by just reading the issue IDs in timeline. We needed to mouse over each ID to see the summary and recognized the issue. I have added an option to change the IDs in timeline to summary of issues. Currently work on PR: https://github.com/mantisbt/mantisbt/pull/1127#discussion_r128000367
Additional Information	A default parameter "$p_long_link = false" is added to function string_get_bug_view_link(). If "$p_long_link = true", return the link as "id: summary". A new configuration $g_timeline_show_issue_summary is added. In order to change timeline display the summary in issue links. If this it is set to true. "id: summary" will shown in timeline. A configuration value "g_timeline_issue_summary_length" is used to truncate long summary. But this may change to be automatic controlled by CSS for a better layout.
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