Add a project type for Pep/10 ASMB5, including OS and user assembly code.
Add assembler-specific menu items.
The assembler still needs to be hooked in, but depends on #509 to communicate assembly errors. The debugging pane depends on #388, which depends on the assembler.
The assembler still needs to be hooked in, but depends on #509 to communicate assembly errors. The debugging pane depends on #388, which depends on the assembler.