v0.24.0 - Relieved Raven

Notable changes

• added random rotation for pieces via Alt+r
• added zoom-to-cursor for Ctrl+mousewheel
• added (slight) random rotation to dice when rolled
• added Tatami background and tweaked Carpet/Leather backgrounds

Other changes

• added slight stain marks to tabletop
• improved material rendering and fixed linen border bug
• improved copy/cut/paste behavior for numbered tokens
• improved token number circle to have material
• improved blue main menu bar
• improved material display on transparent png pieces
• improved allowed characters in snapshot filenames
• fixed pointer/los-line part of selection
• fixed token label has sometimes odd cut-off
• fixed missing material on default upload preview token
• fixed missing shadow on default upload preview token
• refactored imports and module responsibility