v0.3.1

Added:

• add -base flag for custom base address in binary mode
• add -o - flag for stdout output
• add -output-unofficial flag to output unofficial opcodes as mnemonics
• add -stop-at-unofficial flag to stop tracing at unofficial opcodes
• add multi-bank ROM support with per-bank vectors

Fixed:

• fix binary mode incorrectly including NES segments
• fix tracing continuing after BRK instruction
• fix unconditional branch detection for complementary branch patterns