Enable Typescript noImplicitThis (#33250)

- Enable https://www.typescriptlang.org/tsconfig/#noImplicitThis
- Wrap Vue Template-Syntax SFCs in
[`defineComponent`](https://vuejs.org/api/general#definecomponent) which
makes type inference and linter work better
- Move `createApp` calls outside the SFCs into separate files
- Use [`PropType`](https://vuejs.org/api/utility-types#proptype-t) where
appropriate
- Some top-level component properties changed order as dictated by the
linter
- Fix all tsc and lint issues that popped up during these refactors

web_src/js/components/DiffFileList.vue

@@ -17,7 +17,7 @@ function toggleFileList() {
   store.fileListIsVisible = !store.fileListIsVisible;
 }
 
-function diffTypeToString(pType) {
+function diffTypeToString(pType: number) {
   const diffTypes = {
     1: 'add',
     2: 'modify',
@@ -28,7 +28,7 @@ function diffTypeToString(pType) {
   return diffTypes[pType];
 }
 
-function diffStatsWidth(adds, dels) {
+function diffStatsWidth(adds: number, dels: number) {
   return `${adds / (adds + dels) * 100}%`;
 }