NEXXT 3.7.7 released

This time, there's a small but decent quality of life improvement.

Open Session (ctrl+o) now accepts nearly any kind of NES associated asset in addition to sessions. 
This means a reduction in unwarranted warning message that you're trying to 'open the wrong type of file'. 
The Open Session File Dialog has been fitted with various extra file extensions to match. 

While it's still mainly to filter and open sessions, you can now treat it as a more generalized open action. 

Another minor new feature is 'highlight used colours from ALL subpalettes' across the system palette. Hold shift + ctrl + hover over any of the subpalettes. 

Lastly, a bugfix makes highlighting colours behave more consistently / as expected, whether you highlight colours from one or all subpalettes.