Add setting, clean up drawing, fix true color

src/common/services/OptionsService.ts

@@ -21,6 +21,7 @@ export const DEFAULT_OPTIONS: ITerminalOptions = Object.freeze({
   cursorBlink: false,
   cursorStyle: 'block',
   cursorWidth: 1,
+  customBlockAndBoxCharacters: true,
   bellSound:  DEFAULT_BELL_SOUND,
   bellStyle: 'none',
   drawBoldTextInBrightColors: true,

src/common/services/Services.ts

@@ -244,6 +244,7 @@ export interface ITerminalOptions {
   cursorBlink: boolean;
   cursorStyle: 'block' | 'underline' | 'bar';
   cursorWidth: number;
+  customBlockAndBoxCharacters: boolean;
   disableStdin: boolean;
   drawBoldTextInBrightColors: boolean;
   fastScrollModifier: 'alt' | 'ctrl' | 'shift' | undefined;