Add: Presets now support enable/disable Passes

Add: Main() and SubToggle() now support switch preset by value.
Change: Preset() filtered out by ShowIf() will not set default values

Fix Select Material Button, and Add CustomMaterialAssetFinder Sample

Increase Button Height

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Merge pull request #69 from JasonMa0012/2.x

Fix OnValidate event on undo

Merge pull request #68 from JasonMa0012/2.x

Optimize the display of Advanced Header

Merge pull request #67 from JasonMa0012/2.x

Remove Debug Code

Merge pull request #66 from JasonMa0012/2.x

Fix Context Menu Event in Ramp Editor

Merge pull request #65 from JasonMa0012/2.x

Fix Context Menu Event in Ramp Editor

Merge pull request #64 from JasonMa0012/2.x

Add LwguiGradient initializers, Fix Gradient Editor time editing