34683 add read only semantics flag (cla: yes, framework)

34684 Add more structure to errors. (cla: yes, framework)

34685 Close platform when tests are complete (dispose compiler and delete font files) (a: tests, cla: yes, tool, waiting for tree to go green)

34686 unpin build daemon and roll dependencies (cla: yes, tool)

34712 Fix FocusTraversalPolicy makes focus lost (a: desktop, cla: yes, framework)

34721 Add category/platformType to emulators (cla: yes)

34723 CupertinoTextField vertical alignment (cla: yes, f: cupertino, framework)

34725 Fix NPE in flutter tools (cla: yes, tool)

34736 Remove flags related to dynamic patching (cla: yes, tool)