Cleanup loading terminal fonts

- Make list of possible fonts fully OCP
- Only mark the loading of a font as 'causesSideEffects'
- Make a view model for the terminal font preferences component
- Move the TTF files next to where they are registered to help with finding them

Signed-off-by: Sebastian Malton <sebastian@malton.name>

types/mocks.d.ts

@@ -32,4 +32,8 @@ declare module "*.png";
 declare module "*.eot";
 declare module "*.woff";
 declare module "*.woff2";
-declare module "*.ttf";
+
+declare module "*.ttf" {
+  const content: string;
+  export = content;
+}