Updates to paraview plugins that simplify resource loading
This update enforces the following behaviors: 1. When resoures are loaded via File->Open, ParaView semantics apply: the apply button must be pressed to complete opening the file. This matches the functionality of the other ParaView readers (that are selectable when there are multiple readers for a file type). 2. When a resource is created via File->New Resource, a modal dialog is presented to the user. When the user presses apply on the dialog, the resource is generated and its representation is rendered. The Properties Panel's apply button is never enabled. NOTE: the original plan was to move the contents of the modal dialog to the Properties Panel. This worked, but it looked pretty bad and was not intuitive. 3. When a resource is created by an operation from the Operation Panel, the resource is generated and its representation is rendered. The Properties Panel's apply button is never enabled.
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