Add character sheet for 'On Mighty Thews' (#7903)

Co-authored-by: birds <famousbirds@gmail.com>

on-mighty-thews/README.md

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+# On Mighty Thews
+
+A character sheet for my favorite lightweight sword-and-sorcery pulp fiction system, **On Mighty Thews**!
+
+[Check out the system here](https://onmightythews.com/)
+
+Includes nifty dice rolling and a quick reference of the rules.

on-mighty-thews/sheet.json

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+{
+    "html": "thews.html",
+    "css": "thews.css",
+    "authors": "famousbirds",
+    "roll20userid": "4657483",
+    "preview": "preview.png",
+    "instructions": "Character sheet for [On Mighty Thews](https://onmightythews.com) by Simon Carryer"
+}

on-mighty-thews/thews.css

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+.charsheet {
+  position: relative;
+  padding-top: 1px !important;
+}
+
+.sheet-thews {
+  position: relative;
+
+  background-image: url(https://raw.githubusercontent.com/Roll20/roll20-character-sheets/master/on-mighty-thews/thews.png);
+  background-color: white;
+  background-repeat: no-repeat;
+  background-size: 100%;
+  height: 630px;
+  width: 840px;
+}
+
+.sheet-thews input, .sheet-thews select, .sheet-thews textarea, .sheet-thews button {
+  position: absolute;
+}
+
+.sheet-text {
+  width: 160px;
+  height: 236px;
+  resize: none;
+}
+.sheet-bonus { height: 236px; }
+.sheet-injury { height: 65px; width: 180px; }
+textarea.sheet-injury-1 { top: 82px; }
+textarea.sheet-injury-2 { top: 168px; }
+textarea.sheet-injury-3 { top: 252px; }
+
+
+.sheet-die {
+  width: 115px;
+  text-align: center;
+  padding-left: 0;
+}
+
+.sheet-row1 {
+  padding-left: 23px;
+}
+
+.sheet-roller {
+  width: 50px;
+  height: 50px;
+  opacity: 0;
+}
+
+.sheet-header    { top: 1px; }
+.sheet-text      { top: 82px; }
+
+.sheet-row1      { top: 150px; }
+.sheet-row2      { top: 306px; }
+
+.sheet-row1-roll { top: 85px; }
+.sheet-row2-roll { top: 238px; }
+
+.sheet-name      { left: 87px; }
+.sheet-reroll    { left: 572px; }
+
+.sheet-bonus     { left: 454px; }
+.sheet-injury    { left: 640px; }
+
+.sheet-col1      { left: 33px; }
+.sheet-col2      { left: 170px; }
+.sheet-col3      { left: 307px; }
+
+.sheet-col1-roll { left: 55px; }
+.sheet-col2-roll { left: 193px; }
+.sheet-col3-roll { left: 330px; }

on-mighty-thews/thews.html

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+<div class="sheet-thews">
+    <input class="sheet-header sheet-name" type="text" name="attr_name" />
+    <input class="sheet-header sheet-reroll" type="number" name="attr_rerolls" />
+
+    <textarea class="sheet-text sheet-bonus" name="attr_bonus"></textarea>
+    <textarea class="sheet-text sheet-injury sheet-injury-1" name="attr_injury_1"></textarea>
+    <textarea class="sheet-text sheet-injury sheet-injury-2" name="attr_injury_2"></textarea>
+    <textarea class="sheet-text sheet-injury sheet-injury-3" name="attr_injury_3"></textarea>
+
+    <select class="sheet-die sheet-row1 sheet-col1" name="attr_d12">
+        <option value="Warrior" selected="selected">Warrior</option>
+        <option value="Sorceror">Sorceror</option>
+        <option value="Explorer">Explorer</option>
+    </select>
+
+    <select class="sheet-die sheet-row1 sheet-col2" name="attr_d8">
+        <option value="Warrior">Warrior</option>
+        <option value="Sorceror" selected="selected">Sorceror</option>
+        <option value="Explorer">Explorer</option>
+    </select>
+
+    <select class="sheet-die sheet-row1 sheet-col3" name="attr_d4">
+        <option value="Warrior">Warrior</option>
+        <option value="Sorceror">Sorceror</option>
+        <option value="Explorer" selected="selected">Explorer</option>
+    </select>
+
+    <input class="sheet-die sheet-row2 sheet-col1" type="text" name="attr_d20" />
+    <input class="sheet-die sheet-row2 sheet-col2" type="text" name="attr_d10" />
+    <input class="sheet-die sheet-row2 sheet-col3" type="text" name="attr_d6" />
+    
+    <button class="roller sheet-row1-roll sheet-col1-roll" type="roll" value="&{template:default} {{@{d12}=[[1d12cs0cf0]]}}"></button>
+    <button class="roller sheet-row1-roll sheet-col2-roll" type="roll" value="&{template:default} {{@{d8}=[[1d8cs0cf0]]}}"></button>
+    <button class="roller sheet-row1-roll sheet-col3-roll" type="roll" value="&{template:default} {{@{d4}=[[1d4cs0cf0]]}}"></button>
+    
+    <button class="roller sheet-row2-roll sheet-col1-roll" type="roll" value="&{template:default} {{@{d20}=[[1d20cs0cf0]]}}"></button>
+    <button class="roller sheet-row2-roll sheet-col2-roll" type="roll" value="&{template:default} {{@{d10}=[[1d10cs0cf0]]}}"></button>
+    <button class="roller sheet-row2-roll sheet-col3-roll" type="roll" value="&{template:default} {{@{d6}=[[1d6cs0cf0]]}}"></button>
+</div>