0.4.0 - Scrolling tilemap support and naming convention changes

New features

• Lots of tilemap improvements, including scrolling support (metatiles and raw tiles)
• input.loadADirX and input.loadADirY
• palette.loadRGB
• tilemap.FLIP_XY attribute
• Various bug fixes and optimisations

Breaking changes

• setSlot macros (such as palette.setSlot) replaced with setIndex to save confusion with paging slots
  • Other slot references not related to mapper slots have been renamed
• Renamed load macros (such as palette.load) to writeBytes
  • Renamed various 'load' and 'send' macro names; procedures that send data to the VDP now start with write, such as writeByte instead of loadByte
• Requires WLA-DX 10.3+