Split common into composite subprojects with project references

- common/tsconfig.json is a solution root referencing layer tsconfigs
- Each layer has composite tsconfig with correct references and outDir
- Break buffer/services cycle via buffer-local service interfaces
- Move cell types, keyboard/unicode types, TaskQueue, and TerminalOptions
- Exclude *.test.ts from composite builds; fix parser IDisposable imports

Co-authored-by: Daniel Imms <Tyriar@users.noreply.github.com>

src/common/input/UnicodeProperties.ts

@@ -0,0 +1,22 @@
+/**
+ * Copyright (c) 2019 The xterm.js authors. All rights reserved.
+ * @license MIT
+ */
+
+import type { UnicodeCharProperties, UnicodeCharWidth } from 'common/input/UnicodeTypes';
+
+export function extractShouldJoin(value: UnicodeCharProperties): boolean {
+  return (value & 1) !== 0;
+}
+
+export function extractWidth(value: UnicodeCharProperties): UnicodeCharWidth {
+  return ((value >> 1) & 0x3) as UnicodeCharWidth;
+}
+
+export function extractCharKind(value: UnicodeCharProperties): number {
+  return value >> 3;
+}
+
+export function createPropertyValue(state: number, width: number, shouldJoin: boolean = false): UnicodeCharProperties {
+  return ((state & 0xffffff) << 3) | ((width & 3) << 1) | (shouldJoin ? 1 : 0);
+}