v5.1.0

Minor

• Add initialize API. This change is backward compatible as it currently only returns initialization state. [tbrebant]
• All files created by the plugin on Android are now placed in a proper subfolder inside the app cache directory, folder called wizAssets. [tbrebant]
• Database is not removed anymore when requesting the deletion of all assets in cache via /. [tbrebant]
• Fix paths problems when passing a file or directory with an uri starting with a slash. [tbrebant]