Include action bar share button with stub functionality.
Bugfix: Set theme in GraphFullscreenActivity.
Add share intents for event details and problem details.
Ensure that share action is only shown if an event/trigger is selected (not considering the host group spinner yet).
Selecting a host group with an empty list of events/problems triggers removal of the share action.
Hide menu items when drawer is opened.
Add Sharable interface to provide a unified method to share objects as plain text.
Implement sharing messages for events and triggers.
Replace &nbsp; with spaces in trigger descriptions/trigger expressions/item descriptions (&nbsp; may appear occasionally in strings from Zabbix).
Add item name to problem and event details.
Ensure that descriptions and expressions are preprocessed everywhere.
Implement share functionality for checks.
Update version to 2.3.0 (26).