[RobertBeekman]

Fixes the node script and pin bugs found by the test suite (#907). Each fix flips the test that pinned the old behaviour.

Fixed

• Nodes from a missing or disabled plugin are kept when a script is saved. Before, saving a profile while a plugin was disabled permanently deleted that plugin's nodes and connections. This includes importing a profile whose activation condition uses nodes from a plugin that isn't installed. The nodes now come back once the plugin is available, like missing brushes and effects already do.
• Disabling a node provider only removes the nodes it created. It used to also remove nodes of the same type created by another provider that was still enabled.
• An input connected to two outputs keeps the connection it reads from after saving and loading. It used to keep the last connection, while the input reads from the first one.
• A node that fails to evaluate sets its outputs to their default values. It used to keep outputting its last good value, so the script carried on with old data. It was also evaluated again for every input reading from it.
• Numeric conversions are consistent. Converting to long rounds like converting to int does, and ToSByte clamps to -128..127 instead of 0..255.
• RemoveNode only raises NodeRemoved for nodes that were in the script.
• Connecting two pins that are already connected no longer adds a second connection.
• The forgivingEnumMatching option of IsTypeCompatible now decides whether a specific enum matches a pin of any enum.
• Untyped pins turn null into the default value for value types, like their code comment says.
• A new InputPin<T> reads its connection right away instead of after its first reset.

Known limitation, left as is

Convert.ToInt32(numeric) and similar calls pick the byte overload, because Numeric converts implicitly to byte. Fixing that means removing implicit conversions, which would break plugins. The test stays and is marked as a known limitation.

Testing

• Artemis.Core.Tests: 1385 passed
• Artemis.UI.Shared.Tests: 176 passed