tilesets

Goal:

• Make level designing with Objects more natural by changing the order of placement and rotation / flipping Objects.

AsIs:

1. Select Object from Tileset.
2. MouseCursor turns into a "GhostPreview" showing the selected Object in a half-transparent way.
3. Place Object in the Map by pressing LMB.
4. Optional: Rotate / flip placed Object. (This feels inconvenient because when the

Currently, it's possible to enter hidden characters like newlines into the various comboboxes in events (and probably map headers, etc.). This can allow copy-paste errors to make their way into the final assembly files, which results in invalid assembler syntax.

For example, the following results in the assembler to output a literal newline in the event's macro, which is invalid syntax:
![ima