Merge branch 'release/1.1.4' into develop

Version 1.1.4

Added: "Esc key cancels all edits to task" user setting in Properties window. Check this setting to make the Esc key back out all text changes when adding or modifying a task. Closes Issue #15: Pressing escape key after editing an entry does not revert the text.
Added feature to append text, entered on a modal sheet, to selected tasks. Keyboard shortcut `T`. Closes Issue #18: Add Feature: Append text to selected tasks.
Bumped version number to 1.1.5.
Merge branch 'release/1.1.5'

Version 1.1.5

Added: Append text to selected tasks (keyboard shortcut `T`). Closes Issue #18: Add Feature: Append text to selected tasks.
Merge branch 'release/1.1.5' into develop

Version 1.1.5

Added: Append text to selected tasks (keyboard shortcut `T`). Closes Issue #18: Add Feature: Append text to selected tasks.
Merge branch 'develop'