SDK v1.0.0

Process

• The compiler has been stable enough for long enough that it makes sense to
  start using semver more formally. So, without further ado, version 1.0.0!

Breaking changes

• #115 - Breaking! - Replace cpm_parse_filename library function with a syscall, but with different parameters. - @davidgiven

Compiler

By @asiekierka:

• llvm-mos/llvm-mos#296 (and successor PRs) - Adds assembler support for illegal opcodes, remaining Rockwell and WDC 65C02 opcodes, WDC 65816 opcodes, and HuC6280 opcodes (PC Engine).
• llvm-mos/llvm-mos#297 - Code generator now emits CLA/CLX/CLY on HuC6280.
• llvm-mos/llvm-mos#299 - Code generator now emits TXY/TYX on W65816/65EL02.
• llvm-mos/llvm-mos#302 - Code generator now emits INC A/DEC A on 65C02.

SDK

• #114 - Update CPM65; add some missing ctype and string functions. - @davidgiven
• #117 - On Mega65 unmap $A000-$BFFF ROM region to provide 45KB of contiguous RAM. - @gurcei

By @asiekierka:

• #119 and later - Add RCP8/e platform for the RedPower Minecraft mod's CPU.
• #122 - Fix off-by-one stack pointer initializations in various targets, obtaining one more byte of soft stack.