Add Highlight Text Fragments button to ribbon
Add Ribbon codebehind for HighlightTextFragmentsButton
Add Highlight Text Fragments Class (with dummy method) and wired up to project.
Add dummy code for highlight. Need to implement.
Add basic implementation. Need to fix one fragment case, resolve multi line split and refactor.
Add support for animation for grouping multi-line selections
Remove support for multi-line grouping highlight support due to possibly ugly transition animation. Instead, split multi-line highlighting into multiple consecutive highlights
Add custom color support
Merge branch 'Feature-AudioRecord' into Feature-CustomShapes
Merge branch 'Feature-ColorPicker' into Feature-CustomShapes

Conflicts:
	PowerPointLabs/PowerPointLabs/Ribbon1.cs
	PowerPointLabs/PowerPointLabs/ThisAddIn.cs
merging conflicts solved and verified.
Rearrange functions in ThisAddIn;
GetActivePane returns null if there's no associated pane
Issue #392: panes won't be associated with window if the window has already been created
Merge branch 'Feature-AudioRecord' into Feature-CustomShapes

Conflicts:
	PowerPointLabs/PowerPointLabs/RecorderTaskPane.cs
	PowerPointLabs/PowerPointLabs/Views/InShowControl.cs
change callbacks order, now application action > windows action > slide action
specially handled window sharing
fixes #392
Resolves #389
Merge branch 'Feature-AudioRecord' into Feature-CustomShapes

Conflicts:
	PowerPointLabs/PowerPointLabs/ThisAddIn.cs
Merge branch 'release_v1.7' into Feature-CustomShapes

Conflicts:
	PowerPointLabs/PowerPointLabs/Ribbon1.cs
	PowerPointLabs/PowerPointLabs/ThisAddIn.cs
resolves #388
Merge branch 'Feature-ColorPicker' into dev-1.8