Export patterns + ui tweaks

[felixroos]

all patterns can now be exported as a json file + the import accepts text files (single pattern) or json files (multiple patterns, as exported).

also, some ui tweaks:

• the name of the active pattern is now shown at the top
• the buttons related to the active pattern have been moved there (edit, duplicate, delete)
• the other buttons are now below the list of user patterns (new, clear, import, export)

below user patterns: