added number conversion in HTML value retrieval

Changes:
- number input fields now return numbers
- range elements removed since they are untested

Additions:
- added min and step specifiers to input fields associated to
  item number properties
- added a color hint for invalidity of
  item number input fields in actor sheet

src/module/actor/actor-sheet.ts

@@ -131,7 +131,7 @@ export class DS4ActorSheet extends ActorSheet<DS4ActorDataType, DS4Actor, DS4Ite
      * The value is parsed to:
      * - Checkbox: boolean
      * - Text input: string
-     * - Number, range input: trimmed string
+     * - Number: number
      * @param el the input element to collect the value of
      */
     private getValue(el: HTMLFormElement): boolean | string | number {
@@ -148,12 +148,18 @@ export class DS4ActorSheet extends ActorSheet<DS4ActorDataType, DS4Actor, DS4Ite
             return value;
         }
 
-        // Numbers and ranges:
-        else if (["number", "range"].includes(el.type)) {
-            const value: string = el.value.trim();
+        // Numbers:
+        else if (el.type === "number") {
+            const value = Number(el.value.trim());
             return value;
         }
 
+        // // Ranges:
+        // else if (el.type === "range") {
+        //     const value: string = el.value.trim();
+        //     return value;
+        // }
+
         // // Radio Checkboxes (untested, cf. FormDataExtended.process)
         // else if (el.type === "radio") {
         //     const chosen: HTMLFormElement = el.find((r: HTMLFormElement) => r["checked"]);