Update notes for v0.46

Truck City v0.46 has just been released. This is the change log:

• Feature: added a few icons to Alt mode (WIP)  

• Improvement: dependency graph (F1, view all) has been made a bit more legible
• Improvement: when a blueprint is imported, it is automatically selected for edition
• Improvement: WASD movement feels better, especially when combined with other scroll modes (border, middle mouse button, gestures)
• Improvement: minor SFX improvements
• Improvement: when blueprints are deleted until no blueprints exist in the library, the video tutorial is shown on how to add blueprints. Inversely, when a blueprint is imported the video tutorial is hidden.
• Improvement: minor improvements in songs
• Bugfix: price for blueprints was sometimes incorrectly calculated when partially force-building; fixed
• Bugfix: complete log may not correctly scroll to the bottom; fixed
• Bugfix: log may become invisible after switching from complete log to most recent; fixed
• Bugfix: trucks save the list of allowed cargo when the game is saved
• Improvement: truck allowed cargo list is alphabetically sorted now
• Bugfix: added protection against very rare bug related to SFX handling that may occur when reloading a game
• Bugfix: corrected windows handling issue that may cause a window to behave incorrectly
• Bugfix: corrected victory condition check where progress was not correctly calculated

Changelog for features not included in the demo:

• Feature: Steam achievements implemented
• Feature: New mission mode maps added
• Feature: Map editor: objective editor added 

• Bugfix: Map editor: interface was glitchy, fixed