remove most uses of as any in typescript

- replaced many uses of `as any` with another more specific cast `as T`
- filled in missing typed for items that needed to be typed
  - new runtime code was added where necessary to satisfy the new types with comments
- added missing theme variable "sidebar-active" to the Theme variables
- forms using `react-hook-form` are now typechecked
- changed some instances of `target` into `currentTarget` while removing `as any` assertions

src/components/common/LocaleSelector.tsx

@@ -1,7 +1,7 @@
 import ComboBox from "../ui/ComboBox";
 import { connectState } from "../../redux/connector";
 import { WithDispatcher } from "../../redux/reducers";
-import { LanguageEntry, Languages } from "../../context/Locale";
+import { Language, LanguageEntry, Languages } from "../../context/Locale";
 
 type Props = WithDispatcher & {
     locale: string;
@@ -15,12 +15,12 @@ export function LocaleSelector(props: Props) {
                 props.dispatcher &&
                 props.dispatcher({
                     type: "SET_LOCALE",
-                    locale: e.currentTarget.value as any
+                    locale: e.currentTarget.value as Language
                 })
             }
         >
             {Object.keys(Languages).map(x => {
-                const l = (Languages as any)[x] as LanguageEntry;
+                const l = Languages[x as keyof typeof Languages];
                 return (
                     <option value={x}>
                         {l.emoji} {l.display}