Add "em" to text(), textmetrics(), fontmetrics().

Change "t" argument to text() and textmetrics() to "text", to match longstanding behavior.
Rearrange textmetrics() arguments to match behavior (which has always matched text() behavior).

Author: jordanbrown0

cheatsheet/snapshot.html

@@ -120,8 +120,8 @@ <h2>2D</h2>
         <code><a href="https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Using_the_2D_Subsystem#polygon">polygon</a>([points])</code>
         <code><a href="https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Using_the_2D_Subsystem#polygon">polygon</a>([points],[paths])</code>
         <code>
-          <a href="https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Text">text</a>(t, size, font, direction, language, script,
-          <br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;halign, valign, spacing)
+          <a href="https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Text">text</a>(text, size, font, direction, language, script,
+          <br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;halign, valign, spacing, em)
         </code>
         <code><a href="https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Importing_Geometry#import">import</a>("&hellip;.<span class="tooltip">ext<span class="tooltiptext">formats: DXF|SVG</span></span>", center, convexity)</code>
         <code><a href="https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Using_the_2D_Subsystem#3D_to_2D_Projection">projection</a>(cut)</code>
@@ -239,8 +239,8 @@ <h2>Functions</h2>
         <code><a href="https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Other_Language_Features#OpenSCAD_Version">version</a></code>
         <code><a href="https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Other_Language_Features#OpenSCAD_Version">version_num</a></code>
         <code><a href="https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Other_Language_Features#parent_module.28n.29_and_.24parent_modules">parent_module</a>(idx)</code>
-        <code><a href="https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Text#textmetrics()">textmetrics</a>(t, size, font,<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;halign, valign, spacing,<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;direction, language, script)</code>
-        <code><a href="https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Text#fontmetrics()">fontmetrics</a>(size, font)</code>
+        <code><a href="https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Text#textmetrics()">textmetrics</a>(text, size, font,<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;direction, language, script,<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;halign, valign, spacing, em)</code>
+        <code><a href="https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Text#fontmetrics()">fontmetrics</a>(size, font, em)</code>
       </article>
       <article>
         <h2>Mathematical</h2>