Fix #487 (True text object support for DRC/LVS) #563
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…erarchical filter for texts. Added Ruby tests for Texts.
…ixed LVS and DRC tests.
The solution is to provide a new layer type: text collections. This layer type can be manipulated by * Boolean AND and NOT with polygons * Polygon interact with texts * Flatten * Text filters Layers of this kind are generated through "labels" now in LVS and DRC. Text layers are more consistent than the previous solution which consisted of pseudo-labels embedded inside polygon layers. Side effect: with text layers the dummy boxes for the text markers (2x2 DBU boxes) are gone. Text layers can participate in LVS connect and connect_global. Text layers are the preferred way to handle texts in DRC and LVS.
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