• Support "Label Aliases" (ENDLOOP EQU ENDSUB)
• Support arbitrary length arithmetic expressions (LDA #1+2+4*5/3)
• Fix jumps to yet-to-be defined labels (issue #2)
• Add support for constant aliases (PTR EQU $06 / SRC EQU PTR)
• Add support for ASCII character literals (LDA #"T" ; high-ASCII) (LDA #'T' ; low-ASCII)
• Add local label support (they start with : or .)

Builds of a2asm for macOS, Linux, and Windows as of 20 Jan 2020.