removed LDDocument::clearSelection and replaced it with a MainWindow implementation

things #2

things

add operators to LDDocument

refactor

Converted magic wand mode and other selection stuff to mvc

more work on mvc

convert MainWindow::deleteSelection to mvc

made lighting more subtle

converted highlighting to mvc

used mvc selection models

more work on mvc

begin model rework

removed unneeded stuff

Removed LDConditionalEdge::becomeEdgeLine

hook up dataChanged

changed Model into an MVC list model and replaced the objects list with a view into the model

add missing switch case

disable lighting in the selection scene

moved matrix calculations, added inverted normals for BFC back sides

BFC INVERTNEXT objects are no longer individual objects

removed GL_POLYGON_SMOOTH because it causes artifacts

made GLCamera a non-QObject

remove GL_POLYGON_SMOOTH because it causes rendering artifacts

renderer rework

begin rendering rework

encoded division slash

added support for circular 8/-primitives

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