Adds Mesh selection on Sector Preview

[llicursi]

Adds a visual and textual feedback when selecting a rendered mesh on Sector Preview view.

mesh-selection-wolvenkit.mp4

Capturing the click over a mesh will select it and display in blue #0000FF to give a visual contrast of current used colors. Also, the worldNode will be displayed on new grid item called "Selection", e.g. : worldNode [145] instanceMeshNode

Implemented:

• Mesh selection on Sector Preview view. Highlighting the Mesh in blue and displaying the name in selection field.
• Renames header from Sector Previews to All Sector Preview, in MeshPreviewBlock.cs
• Split mouse events per type of Preview : Mesh, All Sector, Sector and Entity

Fixed:

• Mouse events on all previews is properly restored when tab focus is restored.

[rfuzzo]

Lgtm, thanks!

[Simarilius-uk]

This is awesome, thanks.