* nongnu/packages/messaging.scm (zoom)[phases]{rename-binary}: New phase. Rename the binary that is called by the wrapper. The binary name must end in "zoom" in order for IPC to work (for single sign-on and handling links from a browser).
Closes #54. Recommitting due to missing signature. * nongnu/packages/messaging.scm (zoom): New variable.
* nongnu/packages/messaging.scm (signal-desktop): New variable.
* nongnu/packages/messaging.scm: New module. (element-desktop): New variable.
