Use the real number of parameters
Remove Lilv dependent files from depends.py
Change the minimum required version for lilv to 0.5
Implement enumeratePlugins() and tidy up the code in lv2backend
Pass an LV2Backend* to DlgPreferences
Add new files to depends.py
Add Qt Designer file for LV2 preference tab
Add a method which return the discovered LV2 plugins
Implement DlgPrefLV2 class
Add LV2 preferences tab to DlgPreferences