0.6.0 - Register preservation, simplified VBlanks, improved metatiles

Full Changelog: 0.5.0...0.6.0

• Added a dynamic register preservation system (see docs) to preserve only the registers you specify, and only if those particular ones get clobbered
  • Default mode works as before, clobbering registers freely - brings gotchas but is most efficient
  • Wrapping calls with utils.preserve and utils.restore lets you specify which registers you don't want clobbering. Those will be preserved (push/popped from the stack) only if the library routine actually clobbers them
  • Automatic mode will preserve everything - simplest but least efficient
• Reworked metatiles to improve efficiency and allow more sizes (such as 3x3)
• Simplified VBlank setup and handling
  • Reworked VBlank to using vdp status polling rather than interrupts, so need for a interrupts.onVBlank section. Use interrupts.waitForVBlank to wait/poll for the next VBlank before your render code
  • interrupts.onVBlank has been removed
  • No need for ei, di unless you need HBlanks
• Various breaking changes and renames
  • vdp module renamed to vdpSettings, to reflect its actual scope

0.5.0 - Improved input and error handling

New features

• Improved input handling (input.ifPressed, input.ifHeld, input.ifReleased, ifXDirPressed etc)
• Assert macro arguments at assemble-time to fail fast and provide user-friendly messages
• Various optimisations
• Adds smslib-zest.asm helper for integration with Zest projects

Breaking changes

• The user overridable setting .defines are now capitalised for consistency with others consts (values that are only set once)
• interrupts.handleVBlank and interrupts.handleHBlank renamed to interrupts.ENABLE_VBLANK and interrupts.ENABLE_HBLANK

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+

0.3.0 - Initial release

Basics all implemented