Implement the Attribute sheet for editing

templates/AttributeItemSheet/header.hbs

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+<header class="sheet-header bordered">
+	<input
+		type="text"
+		class="large"
+		name="name"
+		value="{{item.name}}"
+		title="{{item.name}}"
+		{{disabled (not meta.editable)}}
+		placeholder="{{localize "Name"}}"
+	>
+</header>

templates/AttributeItemSheet/settings.hbs

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+<div>
+	<div class="property">
+		<label for="{{meta.idp}}-key">
+			Key
+		</label>
+		<input
+			type="text"
+			id="{{meta.idp}}-key"
+			name="system.key"
+			value="{{system.key}}"
+		>
+		<p class="hint">
+			This is the computer-friendly identifier for the attribute.
+			When accessing the attribute in rolls, this is the name you will
+			need to use. Changing this WILL break any existing macros you have.
+		</p>
+	</div>
+	<div class="property">
+		<label for="{{meta.idp}}-aboveTheFold">
+			Always Visible?
+		</label>
+		<taf-toggle
+			id="{{meta.idp}}-aboveTheFold"
+			name="system.aboveTheFold"
+			{{checked system.aboveTheFold}}
+		></taf-toggle>
+	</div>
+	{{#if (not system.aboveTheFold)}}
+		<div class="property">
+			<label for="{{meta.idp}}-group">
+				Group
+			</label>
+			<input
+				type="text"
+				id="{{meta.idp}}-group"
+				name="system.group"
+				value="{{system.group}}"
+			>
+		</div>
+	{{/if}}
+</div>

templates/AttributeItemSheet/value.hbs

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+<div class="value-controls">
+	<label for="{{meta.idp}}-min">
+		Minimum
+	</label>
+	<input
+		type="number"
+		id="{{meta.idp}}-min"
+		name="system.min"
+		value="{{system.min}}"
+		{{#if system.isRange}}placeholder="0"{{/if}}
+		{{disabled (not meta.editable)}}
+	>
+
+	<label for="{{meta.idp}}-value">
+		Current Value
+	</label>
+	<input
+		type="number"
+		id="{{meta.idp}}-value"
+		name="system.value"
+		value="{{system.value}}"
+		min="{{system.min}}"
+		max="{{system.max}}"
+		{{disabled (not meta.editable)}}
+	>
+
+	<label for="{{meta.idp}}-max">
+		Maximum
+	</label>
+	<input
+		type="number"
+		id="{{meta.idp}}-max"
+		name="system.max"
+		value="{{system.max}}"
+		{{disabled (not meta.editable)}}
+	>
+</div>