New dialog font (v1.009)

The font was a recurring theme of the feedback I was getting, so I finally decided to change it. For now, only in dialogs, where it has the least impact on the UI. Maybe that'll be enough, we'll see.

Other changes:

• Fixed a bug on "Bigger Threat" difficulty, when reloading the chestnut gun was glitching other weapon sprites
• Improved the tutorial, by adding a message about switching weapons. Also, moved a healing item close to the "ranged attack message", because it seemed to confuse people into attacking it
• Moved a checkpoint on Demo Level 1 - Area 2, to the beginning of that area
• Added another "ledge jump" platform at the beginning of Demo Level 1 - Area 2, so that the player gets a bit more practice
• Improved some sprites
• Added/improved messages
• Added slight indication for certain secrets on levels