Refactor LDObject API

Removed the exiting hacks

Refactor GLRenderer and GLCompiler

Remove "!= nullptr" expressions

null -> nullptr

Refactor edit history

Optimize QVariant in ConfigurationValueBag

Refactor MainWindow's API

Split LDFileLoader (now LDDocumentLoader) into its own files

Refactor LDDocument's API

Make documents members of the main window

More refactor and removal of g_win uses

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mercurial