v1.4

This change adds 'Go to definition' and 'Find usages' support for constants and imports, and allows for labels to be auto-completed when entering text after an assembly mnemonic.

Code folding has also been overhauled, and now supports macro definitions, conditional blocks, and a number of other constructs. A code folding bug has also been corrected, where keywords such as .proc and .scope were incorrectly interpreted as case sensitive.

The "6502 Assembly" file type now includes files with the .mac extension, which is used by ca65 macro definitions.