Cache macro and copy files during editing

[asmelko]

Describe the solution you'd like
Currently, when a file is changed, a program with all of its dependencies (macro and copy files) is reparsed. This may be a parsing bottleneck that increases the response time of the plugin.

It could be useful to parse only such dependencies that got actually changed.

Acceptance criteria

• When user changes an opencode, only the opencode file is reparsed.
• When user changes a macro or copy file, only the opencode file and the changed file are reparsed.

[michalbali256]

Implemented by #129