Bump version to 2.9.3
Fix nightly build link
Enable parallel compilation
Improvements to setTitle on Linux

WM_CLASS should not change after window creation. It's illegal (may only change while the window is in the Withdrawn state) and causes flickering issues on the taskbar.

The native setTitle implementation has been changed to use a better fallback when XChangeProperty fails and _NET_WM_ICON_NAME is also set, in addition to _NET_WM_NAME.