Refs #1969: Fixed Arrow icons on the Continuous-to-Discrete Mapping Editor.
Implementation of change listeners for Bounded and List Tunables and
implementation of the RequestsUIHelp and TunableUIHelper interfaces

Change-Id: Ic45d74e860c2b155ec04a68d2c711683ab596455
added TODOs...
Deprecated an old task
Fixes related to specific SIF views (created from pathwaycommons.org data) in the biopax and cpath2 core plugins.
Fixing a bug with displaying a node's info in the Results Panel for the SIF views generated by CyPath2 app and cpath2-impl core app.
Simplify List and Bounded listeners

Change-Id: I2ff5d90e3844caa0e49473b13eedc626cc9007a3
Made the eastern Results Panel display correct Visual Legend HTML for SIF networks generated from Pathway Commons data.
Clear the handler and title caches when we reset the context

Change-Id: Ieaf0950557421c6c7f0bdf43d07b168e95233372
Fixes #2098: Font Face icons are now positioned correctly on the C2D Editor and italic fonts are rendered properly
Refs #2098: Also improved the alignment of Text icons; and added three dots to long strings again.
Refs #1969: Adds undo support to Remove Visual Mappings Task.
Modify the rest of our internal TunableInterceptors to clear the caches

Change-Id: Ie1a98a72a7115a0fb117e3e2df7d05478d9da791
Switched from boolean to enum for view mode
Refs #1969: Adds undo support to tasks Copy/Create/Remove Visual Style.
Refs #1969: Adds undo support to Rename Visual Style Task.
Refs #1969: Minor refactoring.
Refs #1969: Adds undo support to Remove Selected Discrete Values Action. Fixes updating the visual mapping GUI after the mapping function is changed from somewhere other than the VizMapper GUI.
Refs #1969: Adds undo support to Edit Selected Discrete Values Action and Generate Values Task.
Refs #1969: Adds undo support for setting the current visual style and visual property default values.