Motion (v3.18)

> DEV MESSAGE

This is just a general release of fixes and improvements. Also fixed some critical login errors.

> 3.18 CHANGELOG

Added
- 3D support for Null tool

Changed
- Added stroke to colors on the palettes page

Fixed
- Auto-update not succeeding when motion was in the background or the computer was at sleep
- Message images not working on some Windows setups
- Retry button not working on unsuccessful login
- Timestamp signature on .ZXP that caused the install to fail with some setups