Started DFA cleanup

Advanced/DFAs/tikxset.tex

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+\usetikzlibrary{arrows.meta}
+\usetikzlibrary{shapes.geometric}
+\usetikzlibrary{patterns}
+
+% We put nodes in a separate layer, so we can
+% slightly overlap with paths for a perfect fit
+\pgfdeclarelayer{nodes}
+\pgfdeclarelayer{path}
+\pgfsetlayers{main,nodes}
+
+% Layer settings
+\tikzset{
+	% Layer hack, lets us write
+	% later = * in scopes.
+	layer/.style = {
+		execute at begin scope={\pgfonlayer{#1}},
+		execute at end scope={\endpgfonlayer}
+	},
+	%
+	% Arrowhead tweaks
+	>={Latex[ width=2mm, length=2mm ]},
+	label/.style = {
+		circle,
+		% For automatic red background in solutions
+		fill = \ORMCbgcolor,
+		draw = none
+	},
+	%
+	% Nodes
+	main/.style = {
+		draw,
+		circle,
+		fill = white
+	},
+	accept/.style = {
+		draw,
+		circle,
+		fill = white,
+		double,
+	},
+	hatch/.style = {
+		pattern=north west lines,
+		pattern color=gray
+	}
+}