Change flowchart color (#185)

* Change BG color to white

* Fix flowcharts where graphics overlap with text

* Increase border size

* change arrow style

* Allow standalone building of TikZ flowcharts

Useful for reference or website etc..

* Prevent manual hyphenation in TikZ diagrams

A Bit of a manual tweak.. but worth it to look nicer :D

* Add missing file for flowcharts

---------

Co-authored-by: Cedric <ced@awase.ostal>

book/figures/vars.tex

@@ -1,13 +1,6 @@
 \documentclass[tikz]{standalone}
 \usepackage{tikz}
-\usepackage{siunitx}
+\usepackage[mode=match, reset-text-family=false]{siunitx}
 \DeclareSIUnit\degF{\text{°}F}
-
-\definecolor{codeblue}{RGB}{69, 161, 248}
-\definecolor{codegray}{RGB}{40, 40, 40}
-\usetikzlibrary{shapes,arrows}
-\tikzstyle{decision} = [diamond, draw, fill=codegray, text=white,
-    text width=4.5em, text badly centered, node distance=3cm, inner sep=0pt]
-\tikzstyle{block} = [rectangle, draw, fill=codeblue,  text=white,
-    text width=5em, text centered, rounded corners, minimum height=4em]
-\tikzstyle{line} = [draw, -latex']
+\input{flowcharts_tikz.tex}
+\input{../colors.tex}